(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) 巧算
(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