2022-2023学年华东师大版七年级数学上册《2.13有理数的混合运算》
计算能力提升训练题题(附答案)
1.(1)(﹣5.3)+(﹣3.2)﹣(﹣5.3)﹣(+4.8).
(2).
(3)().
(4)|﹣|﹣×(﹣4)2.
2.已知a,b互为相反数,c,d互为倒数,|m|=2,求3(a+b﹣1)+(﹣cd)2022﹣2m的值.
3.计算:
(1)(﹣8)﹣(﹣1);
(2)45+(﹣30);
(3)﹣1.5﹣(﹣11.5);
(4);
(5)15﹣[1﹣(﹣20﹣4)];
(6)﹣40﹣28﹣(﹣19)+(﹣24);
(7)22.54+(﹣4.4)+(﹣12.54)+4.4;
(8);
(9);
(10);
(11);
(12)11+(﹣22)﹣3×(﹣11);
(13);
(14);
(15)(﹣2)3﹣32;
(16)23÷[(﹣2)3﹣(﹣4)];
(17);
(18).
4.计算
(1)﹣20+(﹣14)﹣(﹣18)﹣13;
(2)(﹣0.5)﹣(﹣3)+2.75﹣(+7);
(3)1×﹣(﹣)×2+(﹣)÷1;
(4)(﹣﹣+)×(﹣24);
(5)﹣22÷﹣[22﹣(1﹣×)]×12;
(6)﹣81÷2×|﹣|﹣(﹣3)3÷27.
5.计算:
(1);
(2).
6.计算
(1)3×(﹣4)﹣35÷7;
(2);
(3)(﹣7.3)﹣(﹣6)+|﹣3.3|+1;
(4).
7.计算
(1)﹣165+265﹣78﹣22+65;
(2);
(3);
(4)32÷(﹣2)3+(﹣2)3×﹣22.
8.用你喜欢的方法计算下面各题:
(1)0.25×3.86×40;
(2)4÷÷4;
(3)49×;
(4);
(5).
9.计算:
(1)﹣30+17;
(2)﹣67﹣(﹣29);
(3)1.5﹣8.9;
(4);
(5);
(6);
(7)﹣17+23+(﹣16)﹣(﹣17);
(8)﹣3+2×|﹣2﹣3|﹣25.
10.计算
(1)1+(﹣2)﹣5+|﹣2﹣3|
(2)﹣12﹣2×(﹣3)+(﹣4)÷
11.计算:.
12.直接填结果.
(1)(﹣﹣)÷.
(2)÷[(+)×].
13.计算:
(1)(﹣+﹣÷;
(2)﹣22÷×(﹣)2.
14.计算:
(1)(﹣﹣+)÷;
(2)﹣14﹣(﹣)2×(﹣3)3﹣(﹣1)2.
15.计算:3×(﹣1)+22+|﹣4|.
16.计算:
(1);
(2).
17.计算题:
(1)24+(﹣14)+(﹣16)+8;
(2)0.25×(﹣2)3﹣[4÷(﹣)2+1].
18.计算:(﹣﹣+1.125)÷(﹣).
19.计算:﹣42÷23+1÷(﹣)3.
20.计算:﹣12022+4×(﹣3)÷(2﹣4).
参考答案
1.解:(1)(﹣5.3)+(﹣3.2)﹣(﹣5.3)﹣(+4.8)
=(﹣5.3)+(﹣3.2)+5.3+(﹣4.8)
=(﹣5.3+5.3)+(﹣3.2﹣4.8)
=0+(﹣8)
=﹣8;
(2)
=(10﹣)×(﹣9)
=﹣10×9+×9
=﹣90+0.5
=﹣89.5;
(3)()
=()×36
=﹣×36﹣×36+×36
=﹣27﹣20+21
=﹣26;
(4)|﹣|﹣×(﹣4)2
=÷﹣×16
=﹣×16
=
=﹣.
2.解:根据题意得:a+b=0,cd=1,m=2或﹣2,
当m=2时,
原式=3×(0﹣1)+(﹣1)2022﹣2×2
=﹣3+1﹣4
=﹣6;
当m=﹣2时,
原式=3×(0﹣1)+(﹣1)2022﹣2×(﹣2)
=﹣3+1+4
=2.
3.解:(1)(﹣8)﹣(﹣1)
=(﹣8)+1
=﹣(8﹣1)
=﹣7;
(2)45+(﹣30)
=45﹣30
=15;
(3)﹣1.5﹣(﹣11.5)
=﹣1.5+11.5
=11.5﹣1.5
=10;
(4)
=
=
=;
(5)15﹣[1﹣(﹣20﹣4)]
=15﹣{1﹣[﹣(20+4)]}
=15﹣[1﹣(﹣24)]
=15﹣(1+24)
=15﹣25
=﹣10;
(6)﹣40﹣28﹣(﹣19)+(﹣24)
=﹣40+(﹣28)+19+(﹣24)
=﹣(40+28+24)+19
=﹣92+19
=﹣(92﹣19)
=﹣73;
(7)22.54+(﹣4.4)+(﹣12.54)+4.4
=22.54+4.4﹣(4.4+12.54)
=26.94﹣16.94
=10;
(8)
=
=
=
=;
(9)
=
=
=﹣0.7+1.4
=0.7;
(10)
=﹣1+2
=1;
(11)
=
=
=;
(12)11+(﹣22)﹣3×(﹣11)
=11﹣22+33
=22;
(13)
=0.1×2×100
=20;
(14);
(15)(﹣2)3﹣32
=﹣8﹣9
=﹣17;
(16)23÷[(﹣2)3﹣(﹣4)]
=23÷(﹣8+4)
=23÷(﹣4)
=
=;
(17)
=
=
=
=;
(18)
=
=﹣45﹣50
=﹣95.
4.解:(1)原式=﹣20﹣14+18﹣13
=﹣29;
(2)原式=﹣0.5+3.25+2.75﹣7.5
=﹣2;
(3)原式=1×+×2+(﹣)×
=×(1+2﹣)
=×
=;
(4)原式=﹣×(﹣24)﹣×(﹣24)+×(﹣24)
=9+4﹣18
=﹣5;
(5)原式=﹣4×﹣(4﹣1+)×12
=﹣3﹣×12
=﹣3﹣38
=﹣41;
(6)原式=﹣81××﹣(﹣27)÷27
=﹣16+1
=﹣15.
5.解:(1)
=1.5﹣(﹣4.25)+3.75﹣8.5
=1.5﹣8.5+(4.25+3.75)
=﹣7+8
=1.
(2)
=
=25×1
=25.
6.解:(1)3×(﹣4)﹣35÷7
=﹣12﹣5
=﹣17;
(2)
=×24﹣×24﹣×24
=16﹣6﹣4
=6;
(3)(﹣7.3)﹣(﹣6)+|﹣3.3|+1
=(﹣7.3)+6+3.3+1
=[(﹣7.3)+3.3]+(6+1)
=﹣4+8
=4;
(4)
=1×﹣×(﹣3)
=+
=3.
7.解:(1)﹣165+265﹣78﹣22+65
=(﹣165+265)﹣(78+22)+65
=100﹣100+65
=65;
(2)
=﹣×××3
=﹣1;
(3)
=×(﹣)﹣×(﹣)﹣×(﹣)
=﹣2+1+
=﹣;
(4)32÷(﹣2)3+(﹣2)3×﹣22
=9÷(﹣8)﹣8×﹣4
=﹣1+6﹣4
=.
8.解:(1)原式=0.25×40×3.86
=10×3.86
=38.6;
(2)原式=4×5﹣×
=20﹣
=19;
(3)原式=(48+1)×
=48×+
=46+
=46;
(4)原式=++
=+4
=4;
(5)原式=×(﹣+)
=×(1﹣)
=×
=.
9.解:(1)﹣30+17=﹣13.
(2)﹣67﹣(﹣29)=﹣67+29=﹣38.
(3)1.5﹣8.9=﹣7.4.
(4).
(5).
(6).
(7)﹣17+23+(﹣16)﹣(﹣17)
=﹣17+23﹣16+17
=7.
(8)﹣3+2×|﹣2﹣3|﹣25
=﹣3+10﹣25
=﹣18.
10.解:(1)原式=1﹣2﹣5+5
=﹣1;
(2)原式=﹣1﹣(﹣6)+(﹣8)
=﹣1+6﹣8
=﹣3.
11.解:原式=16÷+﹣
=16×+﹣
=+﹣
=+﹣
=.
12.解:(1)原式=÷=×=;
(2)原式=÷(×)=×5=.
13.解:(1)原式=(﹣+﹣)×24
=×24
=﹣21;
(2)原式=﹣4××
=﹣.
14.解:(1)(﹣﹣+)÷
=(﹣﹣+)×18
=﹣×18﹣×18+×18
=﹣9﹣10+12
=﹣7;
(2)﹣14﹣(﹣)2×(﹣3)3﹣(﹣1)2
=﹣1﹣×(﹣27)﹣1
=﹣1+3﹣1
=1.
15.解:原式=﹣3+4+4
=5.
16.解:(1)原式=81×××
=1;
(2)原式=﹣16﹣3×4×(﹣)×(﹣)
=﹣16﹣12××
=﹣16﹣
=﹣17.
17.解:(1)24+(﹣14)+(﹣16)+8
=(24+8)+[(﹣14)+(﹣16)]
=32+(﹣30)
=2;
(2)0.25×(﹣2)3﹣[4÷(﹣)2+1]
=0.25×(﹣8)﹣(4÷+1)
=(﹣2)﹣(4×+1)
=(﹣2)﹣(9+1)
=(﹣2)﹣10
=﹣12.
18.解:(﹣﹣+1.125)÷(﹣)
=(﹣﹣+1)×(﹣24)
=﹣×(﹣24)﹣×(﹣24)+×(﹣24)
=22+20+(﹣27)
=15.
19.解:﹣42÷23+1÷(﹣)3
=﹣16÷8+1÷(﹣)
=﹣2+1×(﹣27)
=﹣2+(﹣27)
=﹣29.
20.解:﹣12022+4×(﹣3)÷(2﹣4)
=﹣1+4×(﹣3)÷(2﹣4)
=﹣1+(﹣12)÷(﹣2)
=﹣1+6
=5.