(9又2/7+7又2/9)/(5/7+5/9) 巧算

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(9又2/7+7又2/9)/(5/7+5/9) 巧算

(9又2/7+7又2/9)/(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13*(5/7+5/9)/(5/7+5/9)
=13

(9又2/7+7又2/9)/(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13*(5/7+5/9)/(5/7+5/9)
=13

(9 2/7+7 2/9)/(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13