摘要:能简便运算要运用简便方法计算 (1) () (2) (3)1982 (4)10.5×9.5 (5) (6)
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计算(要求能进行简便运算的用简便方法计算)
(1)|
-
|+|
-
|+|
-
|+…+|
-
|;
(2)-53-[(-2)3+(1-0.8×
)÷(-2)];
(3)-9
×15;
(4)(-
)÷(
-
-
).
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(1)|
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 4 |
| 1 |
| 2012 |
| 1 |
| 2011 |
(2)-53-[(-2)3+(1-0.8×
| 3 |
| 4 |
(3)-9
| 18 |
| 19 |
(4)(-
| 1 |
| 36 |
| 5 |
| 12 |
| 7 |
| 9 |
| 2 |
| 3 |