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bel72777

-2а+4а^2 -а^2 +а-а^2 +2=2а^2 -а+2

5х^2 -(-3у^2)-2х^2 •у-8х+6х^2 •у^2 -3х=5х^2 +6х^2 •у^2 -2х^2 •у -11х+3у^2

-х^2 +2ху-2у^2 +4х^2 +2ху+2у^2=3х^2 +4ху

х^2 +2ху-2у^2 -4х^2 -2ху-2у^2=-3х^2 -4у^2

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