用简便方法计算下面各题.(1)4.7×10.2(2)0.88×4.9+5.1×0.88
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解决时间 2021-11-08 09:25
- 提问者网友:玫瑰园
- 2021-11-07 18:41
用简便方法计算下面各题.(1)4.7×10.2(2)0.88×4.9+5.1×0.88
最佳答案
- 五星知识达人网友:零点过十分
- 2021-11-07 18:47
(1)4.7×10.2, =4.7×(10+0.2), =4.7×10+4.7×0.2, =47+0.94, =47.94; (2)0.88×4.9+5.1×0.88, =0.88×(4.9+5.1), =0.88×10, =8.8; (3)2.5×8×0.4×0.125, =(2.5×0.4)×(0.125×8), =1×1, =1; (4)(30.5-15.64-12.36)×0.4, =[30.5-(15.64+12.36)]×0.4, =[30.5-28]×0.4, =2.5×0.4, =1. |
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