摘要:用简便方法计算 (1) 1982 (2) 2.39×91+156×2.39-2.39×47
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用简便方法计算:
①(-32
)×
-(
+
-
-
)×(-24);
②-99
×198;
③(-3)×(-
)+0.25×24.5+(-5
)×(-25%);
④-989×(-9)+989×(-19)-(-989)×10.
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①(-32
| 16 |
| 25 |
| 1 |
| 32 |
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 11 |
| 12 |
②-99
| 98 |
| 99 |
③(-3)×(-
| 1 |
| 4 |
| 1 |
| 2 |
④-989×(-9)+989×(-19)-(-989)×10.
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