题目内容
计算:
①(-2)-(-3)+(+7)-(+11)
②(-36)×(
-
-
)
③-12012+2×(-3)2+(-4)÷(-2)
④(-2ab+3a)-2(2a-b)+2ab.
①(-2)-(-3)+(+7)-(+11)
②(-36)×(
| 4 |
| 9 |
| 5 |
| 6 |
| 7 |
| 12 |
③-12012+2×(-3)2+(-4)÷(-2)
④(-2ab+3a)-2(2a-b)+2ab.
(1)原式=-2+3+7-11
=-2-11+3+7
=-13+10
=-3;
(2)原式=(-36)×
-(-36)×
-(-36)×
=-16-(-30)-(-21)
=-16+30+21
=35;
(3)原式=-1+2×9+2
=-1+18+2
=19;
(4)原式=-2ab+3a-4a+2b+2ab
=(-2+2)ab+(3-4)a+2b
=-a+2b.
=-2-11+3+7
=-13+10
=-3;
(2)原式=(-36)×
| 4 |
| 9 |
| 5 |
| 6 |
| 7 |
| 12 |
=-16-(-30)-(-21)
=-16+30+21
=35;
(3)原式=-1+2×9+2
=-1+18+2
=19;
(4)原式=-2ab+3a-4a+2b+2ab
=(-2+2)ab+(3-4)a+2b
=-a+2b.
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