(9又2/7+7又2/9)除以(7/5+5/9)怎么简算
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![(9又2/7+7又2/9)除以(7/5+5/9)怎么简算](/uploads/image/z/48652-52-2.jpg?t=%289%E5%8F%882%2F7%2B7%E5%8F%882%2F9%29%E9%99%A4%E4%BB%A5%287%2F5%2B5%2F9%29%E6%80%8E%E4%B9%88%E7%AE%80%E7%AE%97)
(9又2/7+7又2/9)除以(7/5+5/9)怎么简算
(9又2/7+7又2/9)除以(7/5+5/9)怎么简算
(9又2/7+7又2/9)除以(7/5+5/9)怎么简算
(5/7+5/9)吧
(9又2/7+7又2/9)除以(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13*(5/7+5/9)/(5/7+5/9)
=13
(65/7+65/9)/((63+25)/45)
=(65(9+7)/63)/(88/45)
=65*16*45/63*88
=65*90/63*11
=650/77