题目内容

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]
(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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