2x^2-5xy+2y^2+3x-3y+1 =2x^2+(3-5y)x+2y^2-3y+1 =2x^2+(3-5y)x+(1-y)(1-2y) =(x-2y+1)(2x-y+1)
因式分解2x∧2-5xy+2y∧2+3x-3y+1
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