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解分式方程 x 2 x - 1 + 2 1 - 2 x = 3 时,去分母化为一元一次方程,正确的是 ( )
x + 2 = 3
x - 2 = 3
x - 2 = 3 ( 2 x - 1 )
x + 2 = 3 ( 2 x - 1 )
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