简便计算49*(2/7+1/5)*25
问题描述：
简便计算49*(2/7+1/5)*25
答
49X(2/7+1/5)X25
=(49X2/7+49X1/5)X25
=(14+49/5)X25
=14X25+49/5X25
=350+245
=595
答
49*(2/7+1/5)*25
=7*7*5*5*(10+7)/(7*5)
=7*5*17
=595
答
=49*25*2/7+49*25*1/5
=14*25+49*5
=350+245
=595
答
原式=7*7*(10+7)5*5/(7*5)
=7*17*5
=595