题目内容
计算:
(1)(
+
-
)×(-12);
(2)2×(-3)2-5÷
×2.
(1)(
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 2 |
(2)2×(-3)2-5÷
| 1 |
| 2 |
(1)原式=
×(-12)+
×(-12)-
×(-12)
=-4-2+6
=0;
(2)原式=2×9-5×2×2
=18-20
=-2.
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 2 |
=-4-2+6
=0;
(2)原式=2×9-5×2×2
=18-20
=-2.
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