[(x+y)^2-(x-y)^2 ]除以2xy

【(x-y)^2+(x+y)(x-y)】除以 2x [(x-y)²+(x+y)(x-y)]除以2x {(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y 已知2x-y除以x+y等于2,求代数式(4x-2y除以x+y)-(4x+4y除以2x-y)的值 [(2x+y)^2-(x+y)(x-4y)-5y^2]除以2x （3a^3/X+Y)^3*(X^2-Y^2)除以（Y-X/Y+X)^2 (y/x+x/y+2)除以（y/x+x/y-2)等于多少 [(x+y)的立方-2(x+y)的平方-4(x+y)】除以(x+y) [(x+y)的立方-2(x+y)的平方-4(x+y)】除以(x+y) [3(x-y)^3-(y-x)^2+x-y]÷(x-y) 多项式除以单项式 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 （x^2-y^2)2除以(x+y)^2再除以（x-y）等于多少 (x-y)^7除以(y-x)^3除以(y-x)^2=_____ y除以X加X除以Y等于2,则X-Y的值为 化简（x^2+y）除以x^2+y/x*x/x^2+y 分式的加减:[(x/y-y/x)除以（x+y）+x（1/y-1/x)]除以1+x/y,其中x=5,y=2 [(x+y)^2-(x-y)^2]除以2xy [(x+y)^2-(x-y)^2 ]除以2xy