1. Представьте в виде дроби выражение

1)3m-7 _ 4m+1 =

      9          6 

2) -4a+1 +  -2a-1 =

        6         10 

3) x-2 _ 2-x =

      x     y

4)a-b _ a-c =

    ab     ac 

5) m-n _ m-2n     =

    mn^{2}m^{3}n

6) 1-x + 2y^{2}-1

     x^{2}       y^{3} 

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