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)
=13(5/7+5/9) /(5/7+5/9)
=13
答
=(65/7+65/9)*7*9/[(5/7+5/9)*7*9]
=(65*9+65*7)/(5*9+5*7)
=65*(9+7)/[5*(9+7)]
=65/5
=13
答
(65/7+65/9)/(5/7+5/9)
=65*(1/7+1/9)/[5(1/7+1/9)]
=65/5
=13