| 用简便方法计算下面各题。 | ||||
|
| (1)1.25×7.9×0.8 =1.25×0.8×7.9 =1×7.9 =7.9 | (2)6.2×9.9 =6.2×10-6.2×0.1 =62-0.61 =61.38 |
| (3)6.8×19+6.8 =6.8×(19+1) =6.8×20 =136 | (4)7.2×5.8+7.2×4.2 =7.2×(5.8+4.2) =7.2×10 =72 |
编辑:chaxungu时间:2026-04-27 13:34:00分类:小学数学题库
| 用简便方法计算下面各题。 | ||||
|
| (1)1.25×7.9×0.8 =1.25×0.8×7.9 =1×7.9 =7.9 | (2)6.2×9.9 =6.2×10-6.2×0.1 =62-0.61 =61.38 |
| (3)6.8×19+6.8 =6.8×(19+1) =6.8×20 =136 | (4)7.2×5.8+7.2×4.2 =7.2×(5.8+4.2) =7.2×10 =72 |