1)....=-2х^3+ху^2+х^2 у-1+х^2 у-ху^2+3х^3=х^3+2х^2 у-1
2....=3х^2+5ху+7х^2 y-5ху-3х^2-7х^2 у+3х^2=3х^2
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1)....=-2х^3+ху^2+х^2 у-1+х^2 у-ху^2+3х^3=х^3+2х^2 у-1
2....=3х^2+5ху+7х^2 y-5ху-3х^2-7х^2 у+3х^2=3х^2