Y 4x 2xy 0. X 2 4xy 4y 2. х-2xy+y. x 2 +y 2 =2x+2y+xy. x²/x+y - x²/x²+2xy+y².

Y 4x 2xy 0. X 2 4xy 4y 2. х-2xy+y. x 2 +y 2 =2x+2y+xy. x²/x+y - x²/x²+2xy+y².
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