题目内容
用简便方法计算。
|
| (1)原式=16.5+3.5+4.2 =20+4.2 =24.2 |
(2)原式=72.6-(18.49+1.51) =72.6-20 =52.6 |
| (3)原式=10.7+(10-0.1) =10.7+10-0.1 =20.6 |
(4)原式=25.78-2.78-7.64 =23-7.64 =15.36 |
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题目内容
用简便方法计算。
|
| (1)原式=16.5+3.5+4.2 =20+4.2 =24.2 |
(2)原式=72.6-(18.49+1.51) =72.6-20 =52.6 |
| (3)原式=10.7+(10-0.1) =10.7+10-0.1 =20.6 |
(4)原式=25.78-2.78-7.64 =23-7.64 =15.36 |