题目内容
计算:
(1)6-(+3)-(-7)+(-2);
(2)-0.5-(-3
)+2.75-7;
(3)-|-9|×|-1
|-(10);
(4)-22×2-3×(-1)2;
(5)(
-
-
)÷(-
);
(6)-99
×36(用简便方法计算).
(1)6-(+3)-(-7)+(-2);
(2)-0.5-(-3
| 1 |
| 4 |
(3)-|-9|×|-1
| 2 |
| 3 |
(4)-22×2-3×(-1)2;
(5)(
| 2 |
| 3 |
| 1 |
| 12 |
| 1 |
| 15 |
| 1 |
| 60 |
(6)-99
| 71 |
| 72 |
(1)6-(+3)-(-7)+(-2)
=6-3+7-2
=8;
(2)-0.5-(-3
)+2.75-7
=-0.5+3.25+2.75-7
=(-0.5-7)+(3.25+2.75)
=-7.5+6
=-1.5;
(3)-|-9|×|-1
|-(10)
=-9×
-10
=-15-10
=-25;
(4)-22×2-3×(-1)2
=-4×2-3×1
=-8-3
=-11;
(5)(
-
-
)÷(-
)
=(
-
-
)×(-60)
=-40+5+4
=-31;
(6)-99
×36
=(-100+
)×36
=-3600+
=-3599
.
=6-3+7-2
=8;
(2)-0.5-(-3
| 1 |
| 4 |
=-0.5+3.25+2.75-7
=(-0.5-7)+(3.25+2.75)
=-7.5+6
=-1.5;
(3)-|-9|×|-1
| 2 |
| 3 |
=-9×
| 5 |
| 3 |
=-15-10
=-25;
(4)-22×2-3×(-1)2
=-4×2-3×1
=-8-3
=-11;
(5)(
| 2 |
| 3 |
| 1 |
| 12 |
| 1 |
| 15 |
| 1 |
| 60 |
=(
| 2 |
| 3 |
| 1 |
| 12 |
| 1 |
| 15 |
=-40+5+4
=-31;
(6)-99
| 71 |
| 72 |
=(-100+
| 1 |
| 72 |
=-3600+
| 1 |
| 2 |
=-3599
| 1 |
| 2 |
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