2x^2-5xy=2y^2-5x-5y-25 因式分解打错了……是2x^2-5xy+2y^2-5x-5y-25

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2x^2-5xy=2y^2-5x-5y-25 因式分解打错了……是2x^2-5xy+2y^2-5x-5y-25

2x^2-5xy=2y^2-5x-5y-25 因式分解打错了……是2x^2-5xy+2y^2-5x-5y-25
2x^2-5xy=2y^2-5x-5y-25 因式分解
打错了……是2x^2-5xy+2y^2-5x-5y-25

2x^2-5xy=2y^2-5x-5y-25 因式分解打错了……是2x^2-5xy+2y^2-5x-5y-25
2x2-5xy+2y2-5x-5y-25
=(2x-y)(x-2y)+ 5(2x-y)-5(x-2y)-25
=(2x-y)(x-2y+5)-5(x-2y+5)
=(x-2y+5)(2x-y-5)

2x^2-5xy+2y^2-5x-5y-25
=(2x-y)(x-2y)-[5(2x-y)-5(x-2y)]-25
=(2x-y-5)(x-2y+5)