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初二数学二次根式练习(一)
1.
(1)﹣
(2)(
﹣
)(
+
)+(
﹣1)2
2.
(1)
(2)
3.
(1)×(
-1)
(2)2×
4.(1)3
-
-
(2)
(3)(
)2+
(4)(
)2+(
)-1+|
-2|-
5.
(1)
(2)
6.
(1)
(2)
7.
(1)
(2)
8.
(1);
(2).
9.
(1)
(2).
10.
(1)
(2)(
-3
)×
11.(1)
(2)
12.
(1)
(2)
(3)(3+
)(
-2)
13.
(1)
(2).
14.
(1)
(2);
15.
初二数学二次根式练习
答案解析部分
1.【答案】
(1)解:﹣
=2-2
(2)解:原式=5﹣2+4﹣2
=7﹣2
2.【答案】
(1)解:
?
(2)解:
?
3.【答案】
(1)解:原式=
-
=
-
(2)解:原式=2
+3
=4
+3
=7
4.【答案】(1)解:原式=9
-5
-
=
(2)解:原式=
+
=
+
(3)解:原式=6-4
+2+3
=8-
(4)解:原式=4+
+2-
-2=4-
5.【答案】(1)解:原式=2
-3+
-1=3
-4
(2)解:原式=
-
+2-1
=2-
+1=3-
6.【答案】(1)解:
(2)解:
=1-
+
=
7.【答案】(1)解:
(2)解:
8.【答案】(1)解:原式=
=
(2)解:原式=3-(-2)+(
)
=
9.【答案】(1)解:原式=
﹣(3﹣2
+2)﹣
=
﹣5+2
﹣
=
(2)解:原式=
﹣
﹣3
=3
﹣6
﹣3
=﹣6
10.【答案】(1)解:原式=2-
+3-1=4-
(2)解:原式==6
-3
=3
11.【答案】(1)解:原式=
=
(2)解:原式=
=
=
12.【答案】(1)解:
?
=
=2
(2)解:
?
=
=2+
(3)解:(3+
)(
-2)
=
-6+5-
=
13.【答案】(1)解:原式=2
﹣2
+
=
(2)解:原式=3﹣2
+2+3﹣2=6﹣2
14.【答案】(1)解:原式=9-2??
=7
(2)解:原式=
15.【答案】(1)化简=,结果=
(2)∵
∴x+=6;原式=4
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