(65/7+65/9)除以(5/7+5/9)这道题如何简算

问题描述:

(65/7+65/9)除以(5/7+5/9)这道题如何简算

(65/7+65/9)除以(5/7+5/9)
=65*(1/7+1/9)除以5*(1/7+1/9)
=65/5
=13