要用简便算法314*0.82+31.4*0.8+31.4 53×0.03-0.7÷30

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要用简便算法314*0.82+31.4*0.8+31.4 53×0.03-0.7÷30
要用简便算法
314*0.82+31.4*0.8+31.4 53×0.03-0.7÷30

要用简便算法314*0.82+31.4*0.8+31.4 53×0.03-0.7÷30
314*0.82+31.4*0.8+31.4
=31.4*8.2+31.4*0.8*31.4*1
=31.4*(8.2+0.8+1)
=31.4*10
=314