5/7×75%+2/7÷4/5简便计算,愿快速回答

如题所述

第1个回答  2013-01-08
答:5/7×75%+2/7÷4/5
=5/7×3/4+2/7×5/4
=5/7×3/4+2/7×3/4+2/7×2/4
=3/4(5/7+2/7)+1/7
=3/4+1/7
=25/28本回答被提问者采纳
第2个回答  2013-01-08
5/7×75%+2/7÷4/5

=5/7×3/4+2/7×5/4
=(5*3+2*5)/(4*7)
=25/28