Ответ:
1) m^2 (m-n)/3m^2 (n-m) =( m-n)/3 (n-m)
2) x(bx+y^2)/3x (b^2+y) = bx+y^2/3(b^2+y)
3) (3a-1)^2/(3a-1)×2 = 3a-1/2
4) не знаю
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Ответ:
1) m^2 (m-n)/3m^2 (n-m) =( m-n)/3 (n-m)
2) x(bx+y^2)/3x (b^2+y) = bx+y^2/3(b^2+y)
3) (3a-1)^2/(3a-1)×2 = 3a-1/2
4) не знаю