题目内容
计算题:(1)-3-(-4)+7
(2)8×(-
)÷|-16|
(3)(
-
-
)×(-24)
(4)(-2)2-|-6|+2-3×(-
)
(5)(-
)+2×(-0.5)2+32÷(-3)
(6)-32-[-5-0.2÷
×(-2)2].
(2)8×(-
| 4 |
| 5 |
(3)(
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
(4)(-2)2-|-6|+2-3×(-
| 1 |
| 3 |
(5)(-
| 1 |
| 2 |
(6)-32-[-5-0.2÷
| 4 |
| 5 |
(1)-3-(-4)+7
=-3+4+7
=(-3)+(4+7)
=(-3)+11
=+(11-3)
=8;
(2)8×(-
)÷|-16|
=8×(-
)÷16
=8×(-
)×
=-8×
×
=-
;
(3)(
-
-
)×(-24)
=
×(-24)-
×(-24)-
×(-24)
=-9+4+18
=(-9)+(4+18)
=(-9)+22
=+(22-9)
=13;
(4)(-2)2-|-6|+2-3×(-
)
=4-6+2+1
=(4+2+1)-6
=7-6
=1;
(5)(-
)+2×(-0.5)2+32÷(-3)
=(-
)+2×0.25+9÷(-3)
=(-
)+0.5+(-3)
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6)-32-[-5-0.2÷
×(-2)2]
=-9-[-5-
×
×4]
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)
=-9+6
=-(9-6)
=-3.
=-3+4+7
=(-3)+(4+7)
=(-3)+11
=+(11-3)
=8;
(2)8×(-
| 4 |
| 5 |
=8×(-
| 4 |
| 5 |
=8×(-
| 4 |
| 5 |
| 1 |
| 16 |
=-8×
| 4 |
| 5 |
| 1 |
| 16 |
=-
| 2 |
| 5 |
(3)(
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
=-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 |
=(-
| 1 |
| 2 |
=(-
| 1 |
| 2 |
=[(-0.5)+0.5]+(-3)
=0+(-3)
=-3;
(6)-32-[-5-0.2÷
| 4 |
| 5 |
=-9-[-5-
| 1 |
| 5 |
| 5 |
| 4 |
=-9-(-5-1)
=-9-[(-5)+(-1)]
=-9-(-6)
=-9+6
=-(9-6)
=-3.
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