求比多项式3x²﹣2x+4xy+y²少5x²﹣3xy的多项式
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求比多项式3x²﹣2x+4xy+y²少5x²﹣3xy的多项式
求比多项式3x²﹣2x+4xy+y²少5x²﹣3xy的多项式
求比多项式3x²﹣2x+4xy+y²少5x²﹣3xy的多项式
(3x²﹣2x+4xy+y²)-(5x²﹣3xy)
=3x²﹣2x+4xy+y²-5x²+3xy
=(3-5)x²-2x+(4+3)xy+y²
=-2x²-2x+7xy+y²
3x²﹣2x+4xy+y²﹣(5x²﹣3xy)
=3x²﹣2x+4xy+y²﹣5x²+3xy
=(3x²﹣5x²)+(4xy+3xy)﹣2x
=-2x²+7xy-2x