问题 解答题
计算题:(1)-3-(-4)+7
(2)8×(-
4
5
)÷|-16|

(3)(
3
8
-
1
6
-
3
4
)×(-24)

(4)(-2)2-|-6|+2-3×(-
1
3
)

(5)(-
1
2
)+2×(-0.5)2+32÷(-3)

(6)-32-[-5-0.2÷
4
5
×(-2)2]
答案

(1)-3-(-4)+7

=-3+4+7

=(-3)+(4+7)

=(-3)+11

=+(11-3)

=8;

(2)8×(-

4
5
)÷|-16|

=8×(-

4
5
)÷16

=8×(-

4
5
1
16

=-

4
5
×
1
16

=-

2
5

(3)(

3
8
-
1
6
-
3
4
)×(-24)

=

3
8
×(-24)-
1
6
×(-24)-
3
4
×(-24)

=-9+4+18

=(-9)+(4+18)

=(-9)+22

=+(22-9)

=13;

(4)(-2)2-|-6|+2-3×(-

1
3
)

=4-6+2+1

=(4+2+1)-6

=7-6

=1;

(5)(-

1
2
)+2×(-0.5)2+32÷(-3)

=(-

1
2
)+2×0.25+9÷(-3)

=(-

1
2
)+0.5+(-3)

=[(-0.5)+0.5]+(-3)

=0+(-3)

=-3;

(6)-32-[-5-0.2÷

4
5
×(-2)2]

=-9-[-5-

1
5
×
5
4
×4]

=-9-(-5-1)

=-9-[(-5)+(-1)]

=-9-(-6)

=-9+6

=-(9-6)

=-3.

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