(9又2⼀7+7又2⼀9)⼀(5⼀7+5⼀9) 巧算

2025-04-16 03:44:26
推荐回答(2个)
回答1:

(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

回答2:

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