如何分解因式 3x^2-2x-2y^2+4y-5xy

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如何分解因式 3x^2-2x-2y^2+4y-5xy

如何分解因式 3x^2-2x-2y^2+4y-5xy
如何分解因式 3x^2-2x-2y^2+4y-5xy

如何分解因式 3x^2-2x-2y^2+4y-5xy
3x²-2x-2y²+4y-5xy
=(3x²-5xy-2y²)-2(x-2y)
=(x-2y)(3x+y)-2(x-2y)
=(x-2y)(3x+y-2)

不会

3x^2-2x-2y^2+4y-5xy
=3x^2-5xy -2y^2-2x+4y
=(3x+y)(x-2y)-2(x-2y)
=(x-2y)(3x+y-2)

(x^2-2x+1) + (2x^2-5xy+2y^2) -(4y^2-4y+1)
=(x-1)^2 +(2x-y)*(x-2y)- (2y-1)^2
= (2x-y)(x-2y)+ (x-1+2y-1)(x-1-2y+1)
=(2x-y)(x-2y)+(x+2y-2)(x-2y)
=(x-2y)(2x-y+x+2y-2)
=(x-2y)(3x+y-2)