Правильно ли решено?

Question

Правильно ли решено?

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Answer 1

2m-4m^2=2m(1-4m)

2m(1-4m)/m+1 *m+1/2m^2=1-4m/m

1-4m/m=(1-4*1/2):1/2=-1:1/2=-2