29分之7乘8分之3加12分之7加29分之3乘9分之7怎样算简便
问题描述:
29分之7乘8分之3加12分之7加29分之3乘9分之7怎样算简便
答
(7/29)*(3/8)+(7/12)+(3/29)*(7/9)=7*((1/29)*(3/8)+(1/12)+(3/29)*(1/9))=7*((1/29)*(3/8)+(3/29)*(1/9)+(1/12))=7*((1/29)*(3/8)+(1/29)*(1/3)+(1/12))=7*((1/29)*((3/8)+(1/3))+(1/12))=7*((1/29)*((9/24)+(8/24)...