[(x+2y)(x-2y)+4(x-y)²]÷6x

(2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) {(x+2y)(x-2y)+[2(x-y)]²｝÷6x=? x^2-y^2/x+y-4x(x-y)+y^2/2x-y, [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 1、x(x-y)(x+y)-x(x+y)^2 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 化简:【(2x-y)(2x+y)+y(y+6x)】÷2x （x-2y）²+（2x-4y)(x+y)+(x+y)² {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20