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
49*(2/7+1/5)*25
=7*(2 +7/5)*25
=7*(10 +7)*5
=35*17
=30*17+5*17
=510+85
=595
答
49=7*7
25=5*5
为5*7*5*7*(2/7+1/5)=5*7*(2*5+1*7)=5*7*17=595
答
简便计算:
49*(2/7+1/5)*25
=49*25*2/7+49*25/5
=350+245
=595
答
49*(2/7+1/5)*25
=49*25*(2/7+1/5)
=49*25*2/7+49*25*1/5
=7*25*2+49*5
=595