怎样简便就怎样计算7/9÷4/15+2/9×15/14
问题描述:
怎样简便就怎样计算
7/9÷4/15+2/9×15/14
答
7/9÷4/15+2/9×15/14
=7/9×15/4+2/9×15/14
=(7/4)(15/9)+(2/14)(15/9)
=(7/4+1/7)(5/3)
=[(49+4)/28](5/3)
=(53/28)(5/3)
=265/84