【(x-2y)²-2(x+y)(3x-y)-6y²】÷6y²
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【(x-2y)²-2(x+y)(3x-y)-6y²】÷6y²
【(x-2y)²-2(x+y)(3x-y)-6y²】÷6y²
【(x-2y)²-2(x+y)(3x-y)-6y²】÷6y²
=(x^2+4y^2-4xy-2(3x^2-xy+3xy-y^2)-6y^2)/(6y^2)=(-5x^2+6y^2-8xy-6y^2)/(6y^2)=(-5x^2-8xy)/(6y^2)