问题 解答题
计算:
(1)(-12)-5+(-14)-(-39)
(2)-32÷(-3)2+3×(-2)+|-4|
(3)[(-
1
6
)-(-
5
12
)+
2
15
]×(-60)
(4)-
4
5
×[(-
1
2
)÷(0.75-1)+(-2)5]
答案

(1)(-12)-5+(-14)-(-39)

=-12-5-14+39

=-31+39

=8;

(2)-32÷(-3)2+3×(-2)+|-4|

=-9÷9-6+4

=-1-6+4

=-3;

(3)[(-

1
6
)-(-
5
12
)+
2
15
]×(-60)

=

1
6
×60-
5
12
×60-
2
15
×60

=10-25-8

=-23;

(4)-

4
5
×[(-
1
2
)÷(0.75-1)+(-2)5]

=-

4
5
×[(-
1
2
)÷(-
1
4
)-32]

=-

4
5
×[2-32]

=-

4
5
×[-30]

=24.

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