(9*2/7+7*2/9)/(5/7+5/9)的简便运算
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(9*2/7+7*2/9)/(5/7+5/9)的简便运算
(9*2/7+7*2/9)/(5/7+5/9)的简便运算
(9*2/7+7*2/9)/(5/7+5/9)的简便运算
(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