(2×y+x²-y²)-(x²-y²-3xy) 计算题,

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(2×y+x²-y²)-(x²-y²-3xy) 计算题,
(2×y+x²-y²)-(x²-y²-3xy) 计算题,

原式=2xy+x2-y2-x2+y2+3xy
=5xy