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【*代表乘号/代表除号13.14*70.1-0.314+314*0.321.25*67.875+1250.7875+1250*0.05337530.125*2.5*64*0.546.25*8.72*16+3.75*0.827*8】
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问题描述:

*代表乘号/代表除号

13.14*70.1-0.314+314*0.3

21.25*67.875+1250.7875+1250*0.053375

30.125*2.5*64*0.5

46.25*8.72*16+3.75*0.827*8

宋世德回答:
  13.14*70.1-0.314+314*0.3   =0.314*10*70.1-0.314+0.314*1000*0.3   =0.314*701-0.314*+0.314*300   =0.314*(701-1+300)   =0.314*1000   =314   21.25*67.875+125*0.7875+1250*0.053375   =1.25*67.875+1.25*100*0.7875+1.25*1000*0.053375   =1.25*67.875+1.25*78.75+1.25*53.375   =1.25*(67.875+78.75+53.375)   =1.25*200   =250   30.125*2.5*64*0.5   =0.125*2.5*(8*4*2)*0.5   =(0.125*8)*(2.5*4)*(2*0.5)   =1*10*1   =10   46.25*8.72*16+3.75*0.827*8   这个错了   应该是   6.25*0.872*16+3.75*8.72*8   =6.25*0.872*(8*2)+3.75*0.872*10*8   =(6.25*2)*0.872*8+(3.75*10)*0.872*8   =12.5*0.872*8+37.5*0.872*8   =(12.5+37.5)*0.872*8   =50*8*0.872   =400*0.872   =348.8
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