[(x+2y)(x-2y)+4(x-y)^2-6x]/(6x)计算

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[(x+2y)(x-2y)+4(x-y)^2-6x]/(6x)计算
[(x+2y)(x-2y)+4(x-y)^2-6x]/(6x)计算

[(x+2y)(x-2y)+4(x-y)^2-6x]/(6x)计算
[(x+2y)(x-2y)+4(x-y)^2-6x]/(6x)
=[(x^2-4y^2)+(4x^2-8xy+4y^2)-6x]/(6x)
=(x^2-4y^2+4x^2-8xy+4y^2-6x)/(6x)
=(5x^2-8xy-6x)/(6x)
=5x/6-4y/3-1