解分式方程 1 - x x - 2 = 1 2 - x - 2 时,去分母变形正确的是 ( )
- 1 + x = - 1 - 2 ( x - 2 )
1 - x = 1 - 2 ( x - 2 )
- 1 + x = 1 + 2 ( 2 - x )
1 - x = - 1 - 2 ( x - 2 )
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