问题 解答题
计算
①23+(-37)-23+7               
②(
2
3
-
1
4
-
3
8
)×(-24)
③-22-(-3)2×(-1)3
④4×(-8)×25×(-1.25)
⑤4-[(-5-3)÷23]+32÷(-2)3
答案

①23+(-37)-23+7

=23+(-37)+(-23)+7

=(23+7)+[(-37)+(-23)]

=30+(-60)

=-(60-30)

=-30;

②(

2
3
-
1
4
-
3
8
)×(-24)

=

2
3
×(-24)-
1
4
×(-24)-
3
8
×(-24)

=-16-(-6)-(-9)

=-16+6+9

=-16+(6+9)

=-16+15

=-(16-15)

=-1;

③-22-(-3)2×(-1)3

=-4-9×(-1)

=-4-(-9)

=-4+9

=+(9-4)

=5;

④4×(-8)×25×(-1.25)

=4×8×25×(1.25)

=(4×25)×(8×1.25)

=100×10

=1000;

⑤4-[(-5-3)÷23]+32÷(-2)3

=4-{[(-5)+(-3)]÷8}+32÷(-8)

=4-(-8)÷8+(-4)

=4-(-1)+(-4)

=4+1+(-4)

=[4+(-4)]+1

=1.

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