【(x-2y)²-2(x+y)(3x-y)-6y²】÷6y²
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
{(x+2y)(x-2y)+[2(x-y)]²}÷6x=?
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
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