(9又2/7+7又2/9)÷(5/7+5/9)
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(9又2/7+7又2/9)÷(5/7+5/9)
(9又2/7+7又2/9)÷(5/7+5/9)
(9又2/7+7又2/9)÷(5/7+5/9)
﹙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)
(9又2/7+7又2/9)÷(5/7+5/9)
(9又2/7+7又2/9)÷(5/7+5/9)
﹙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.