分解因式:x^2-x-4y^2+2y

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分解因式:x^2-x-4y^2+2y
分解因式:x^2-x-4y^2+2y

分解因式:x^2-x-4y^2+2y
x^2-x-4y^2+2y
=(x^2-4y^2)-(x-2y)
=(x+2y)(x-2y)-(x-2y)
=(x-2y)(x+2y-1)

(x^2-4y^2)-(x-2y)
(x+2y)(x-2y)-(x-2y)
(x-2y)(x+2y-1)

x^2-x-4y^2+2y
=x^2-4y^2-(x-2y)
=(x+2y+(x-2y)-(x-2y)
=(x-2y)(x+2y-1)

x^2-x-4y^2+2y =x^2-4y^2-x+2y =(x^2-4y^2)-(x-2y)=( x-2y)(x+2y)-(x-2y)= (x-2y)( x+2y-1)