18.2二次根式的运算同步练习（沪科版八下）
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| 名称 | 18.2二次根式的运算同步练习（沪科版八下） |  | |
| 格式 | rar | ||
| 文件大小 | 77.2KB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 沪科版 | ||
| 科目 | 数学 | ||
| 更新时间 | 2010-05-07 13:15:00 | ||
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本资料来自于资源最齐全的２１世纪教育网www.21cnjy.com
18.2二次根式的运算
课内练习
A组
1．判断题（对的打“∨”，错的打“×”）
（1）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （ ）;
（2）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =1 （ ）
（3）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （ ）;
（4）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =20（ ）
2．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______;3．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______;4．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
5．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______;6．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
7．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
8．下列各式正确的是（ ）
A．已知ab>0，则HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ;B．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =（2×3）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =5HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
C．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 D．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
9．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）=________;10．计算：-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______．
11．一个三角形的面积为2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，若它的一条边上的高为HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，求这条边长．
B组
12．解方程：-2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
13．已知等腰三角形的腰长为HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 cm，底边为2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 cm，求它的面积．
14．比较两个实数大小：-9HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 与-10HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
15．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
16．如图，△ABC中，∠ACB=Rt∠，AB=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，BC=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，求斜边AB上的高CD．
( http: / / www.21cnjy.com / )
课外练习
A组
1．填空：
（1）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________；（2）9÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________；（3）（HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________；
（4）4HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______；（5）2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷（-3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）=________．
2．下列各式计算正确的是（ ）
A．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 B．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
C．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =3×2×5=30 D．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·5HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =8HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
3．已知a=1-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，b=1+HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，则a2+ab+b2的值 （ ）
A．3 B．5 C．6 D．7
4．计算：（1）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·（-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）； （2）6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ；
（3）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×（-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）÷3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
5．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________; 6．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________; 7．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
8．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________; 9．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
10．已知等边三角形的边长为4HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，求它的高．
B组
11．解方程：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 x=-1．
12．化简HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
13．当x=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -3时，求代数式x2+6x+9的值．
14．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
15．如图，已知△ABC中，∠ABC=Rt∠，AB=2，BC=1，AD=AB，求HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 的值．
( http: / / www.21cnjy.com / )
参考答案
【课内练习】
1．（1）× （2）× （3）× （4）×
2．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 3．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 4．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 5．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
6．2 000HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 7．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 8．D 9．3-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
10．-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 11．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 12．x=-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 13．6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 cm2
14．-9HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 >-10HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 15．2-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
16．可以求得AC=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，∴CD=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （利用面积法）
【课外练习】
1．（1）42 （2）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （3）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -3 （4）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （5）-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
2．C 3．B
4．（1）-9HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （2）4HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （3）-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
5．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 6．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
7．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 8．8×103 9．0.02 10．6 11．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
12．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 当x>0时为1，当x<0时为-1
13．（x+3）2=（HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）2=7
14．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
15．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
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18.2二次根式的运算
课内练习
A组
1．判断题（对的打“∨”，错的打“×”）
（1）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （ ）;
（2）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =1 （ ）
（3）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （ ）;
（4）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =20（ ）
2．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______;3．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______;4．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
5．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______;6．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
7．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
8．下列各式正确的是（ ）
A．已知ab>0，则HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ;B．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =（2×3）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =5HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
C．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 D．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
9．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）=________;10．计算：-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______．
11．一个三角形的面积为2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，若它的一条边上的高为HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，求这条边长．
B组
12．解方程：-2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
13．已知等腰三角形的腰长为HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 cm，底边为2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 cm，求它的面积．
14．比较两个实数大小：-9HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 与-10HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
15．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
16．如图，△ABC中，∠ACB=Rt∠，AB=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，BC=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，求斜边AB上的高CD．
( http: / / www.21cnjy.com / )
课外练习
A组
1．填空：
（1）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________；（2）9÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________；（3）（HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________；
（4）4HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =_______；（5）2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷（-3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）=________．
2．下列各式计算正确的是（ ）
A．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 B．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
C．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =3×2×5=30 D．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·5HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =8HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
3．已知a=1-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，b=1+HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，则a2+ab+b2的值 （ ）
A．3 B．5 C．6 D．7
4．计算：（1）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ·（-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）； （2）6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ；
（3）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×（-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）÷3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
5．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________; 6．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________; 7．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ÷HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
8．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ×HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________; 9．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
10．已知等边三角形的边长为4HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，求它的高．
B组
11．解方程：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 x=-1．
12．化简HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =________．
13．当x=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -3时，求代数式x2+6x+9的值．
14．计算：HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ．
15．如图，已知△ABC中，∠ABC=Rt∠，AB=2，BC=1，AD=AB，求HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 的值．
( http: / / www.21cnjy.com / )
参考答案
【课内练习】
1．（1）× （2）× （3）× （4）×
2．3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 3．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 4．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 5．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
6．2 000HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 7．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 8．D 9．3-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
10．-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 11．2HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 12．x=-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 13．6HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 cm2
14．-9HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 >-10HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 15．2-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
16．可以求得AC=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ，∴CD=HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （利用面积法）
【课外练习】
1．（1）42 （2）3HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （3）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -3 （4）HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （5）-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
2．C 3．B
4．（1）-9HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （2）4HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 （3）-HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
5．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 6．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
7．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 8．8×103 9．0.02 10．6 11．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
12．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 当x>0时为1，当x<0时为-1
13．（x+3）2=（HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 ）2=7
14．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 -HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
15．HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 =HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4 HYPERLINK "http://www.21cnjy.com/" EMBED Equation.DSMT4
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