题目内容
用简便方法计算:
(1)-
-
-
+
-2
(2)-9
×15
(1)-
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
(2)-9
| 18 |
| 19 |
(1)原式=(-
-
)+(
-
)-2=-1+0-2=-3;
(2)原式=(-10+
)×15=-150+
=-149
.
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 3 |
(2)原式=(-10+
| 1 |
| 19 |
| 15 |
| 19 |
| 4 |
| 19 |
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