15.5乘1.5减210乘0.05加0.15乘55 怎么简便计算
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15.5乘1.5减210乘0.05加0.15乘55 怎么简便计算
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![15.5乘1.5减210乘0.05加0.15乘55 怎么简便计算](/uploads/image/z/2538020-20-0.jpg?t=15.5%E4%B9%981.5%E5%87%8F210%E4%B9%980.05%E5%8A%A00.15%E4%B9%9855+%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
15.5×1.5-210×0.05+0.15×55
=15×(15.5×0.1-14×0.05+0.01×55)
=15×5×(3.1×0.1-14×0.01+0.01×11)
=75×(31×0.01-14×0.01+11×0.01)
=75×0.01×(31-14+11)
=75×0.01×28
=21
=15×(15.5×0.1-14×0.05+0.01×55)
=15×5×(3.1×0.1-14×0.01+0.01×11)
=75×(31×0.01-14×0.01+11×0.01)
=75×0.01×(31-14+11)
=75×0.01×28
=21