解方程 2/9+3/4=5/9x =解方程 2/9+3/4=5/9x = = = 3/7x+11/7x=12 = = =

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解方程 2/9+3/4=5/9x =解方程 2/9+3/4=5/9x = = = 3/7x+11/7x=12 = = =
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解方程 2/9+3/4=5/9x =解方程 2/9+3/4=5/9x = = = 3/7x+11/7x=12 = = =
解方程 2/9+3/4=5/9x =
解方程 2/9+3/4=5/9x = = = 3/7x+11/7x=12 = = =

解方程 2/9+3/4=5/9x =解方程 2/9+3/4=5/9x = = = 3/7x+11/7x=12 = = =