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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