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计算(写出计算过程).(1)(-3.14)+(4.96)+(2.14)+(-7.96)(2)

2022-08-15 16:14:13 问答库 阅读 207 次

问题详情

计算(写出计算过程).
(1)(-3.14)+(4.96)+(2.14)+(-7.96)
(2)(-21

8

)+(5)+(-31

2

)+(1.125)+(41

2

)
(3)(-3.2)×1.5
(4)13

4

×(-8)
(5)(-4)×1

3

×(-25)×(-6).
(6)24×(1

8

-1

6

-1

4

)
(7)(1

4

-1

9

-1

18

-1

12

)×(-36)
(8)-9998

99

×9
(9)2011×21

3

×0×(-389)
(10)-125÷(-25)-64÷(-4)
(11)2×(-3)2-5÷1

2

×2
(12)(-2)3×8-8×(1

2

)3+8÷1

8

参考答案

(1)(-3.14)+(+4.96)+(+2.14)+(-7.96)
=-3.14+2.14+4.96-7.96
=-1-3
=-4;

(2)(-218)+(+5)+(-312)+(+1.125)+(+412)
=-2.125+1.125-3.5+4.5+5
=-1+1+5
=5;

(3)(-3.2)×1.5
=-4.8;

(4)134×(-8)
=-22;

(5)(-4)×13×(-25)×(-6)
=-4×13×25×6
=-200;

(6)24×(18-16-14)
=24×18-24×16-24×14
=3-4-6
=-7;

(7)(14-19-118-112)×(-36)
=14×(-36)-19×(-36)-118×(-36)-112×(-36)
=-9+4+2+3
=0;

(8)-999899×9
=(-100+199)×9
=-100×9+199×9
=-900+111
=-8991011;

(9)2011×213×0×(-389)
=0;

(10)-125÷(-25)-64÷(-4)
=5+16
=21;

(11)2×(-3)2-5÷12×2
=2×9-5×2×2
=18-20
=-2;

(12)(-2)3×8-8×(12)3+8÷18
=-8×8-8×18+8×8
=-64-1+64
=-1.

考点:过程