简算:(65/7+65/9)/(5/7+5/9)
问题描述:
简算:(65/7+65/9)/(5/7+5/9)
答
(65/7+65/9)/(5/7+5/9)
=65*(1/7+1/9)/[5(1/7+1/9)]
=65/5
=13