问题 解答题
计算:
(1)12-(-18)+(-7)-15                                     
(2)(-
2
3
)2÷
8
9
×(-3)

(3)125
5
7
÷(-5)

(4)-16-(-1-0.5)×
1
3
÷(-2)2
答案

(1)12+18-7-15

=30-22

=8;

(2)原式=

4
9
×
9
8
×(-3)

=-

3
2

(3)原式=(125+

5
7
)×(-
1
5

=-25

1
7

(4)原式=-1-(-

3
2
)×
1
3
÷4

=-1+

1
8

=-

7
8

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