5x²-(3y²+7xy)+(2y²-5x²),化简
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5x²-(3y²+7xy)+(2y²-5x²),化简
5x²-(3y²+7xy)+(2y²-5x²),化简
5x²-(3y²+7xy)+(2y²-5x²),化简
5x²-(3y²+7xy)+(2y²-5x²)
=5x^2-3y^2-7xy+2y^2-5x^2
=-y^2-7xy