简便法0.36×72+45×0.18+45

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简便法0.36×72+45×0.18+45简便法0.36×72+45×0.18+45简便法0.36×72+45×0.18+450.36×72+45×0.18+45=0.36×72+45×(0.18+1

简便法0.36×72+45×0.18+45
简便法0.36×72+45×0.18+45

简便法0.36×72+45×0.18+45
0.36×72+45×0.18+45=0.36×72+45×(0.18+1)=0.36×72+45×1.18=0.36×72+(45x3)×1.18/3=0.36x72+0.36X135=0.36X(72+135)=0.36X208=0.36X200+0.36X8=72+2.88=74.88