因式分解4x^-xy-2y^

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因式分解4x^-xy-2y^因式分解4x^-xy-2y^因式分解4x^-xy-2y^4x-xy-2y=(4-y)y-2y=(4-2-y)y=(2-y)y(2x^-2y)(2x+y)4x-xy-2y=(

因式分解4x^-xy-2y^
因式分解4x^-xy-2y^

因式分解4x^-xy-2y^
4x-xy-2y
=(4-y)y-2y
=(4-2-y)y
=(2-y)y

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

4x-xy-2y
=(4-y)y-2y
=(4-2-y)y
=(2-y)y

x是几次方?y几次方?