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1*3*5+2*6*10+5*15*25/1*5*9+2*10*18+5*25*45简便运算
人气:439 ℃ 时间:2020-03-26 22:03:38
解答
1*3*5+2*6*10+5*15*25/1*5*9+2*10*18+5*25*45
=1*(1*3*5)+2*(1*3*5)+5*(1*3*5)/1*(1*5*9)+2*(1*5*9)+5*(1*5*9)
=(1+2+5)*(1*3*5)/(1+2+5)*(1*5*9)
=1*3*5/1*5*9
=1/3
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