-(x2²-2xy-y²)+(5x²-2xy-3y²)化简

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-(x2²-2xy-y²)+(5x²-2xy-3y²)化简-(x2²-2xy-y²)+(5x²-2xy-3y²)化简-(

-(x2²-2xy-y²)+(5x²-2xy-3y²)化简
-(x2²-2xy-y²)+(5x²-2xy-3y²)化简

-(x2²-2xy-y²)+(5x²-2xy-3y²)化简
原式
=-x的平方+2xy+y的平方+5x的平方-2xy-3y的平方
=4x的平方-2y的平方