x+y=10087.5%x+75%y=81

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = x+y=10087.5%x+75%y=81 x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= (x+y)/y=8/3则x/y=__ y/x-y=___ (x+y)/y=8/3则x/y=__ y/x-y=___ x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? x+x+y+y+y=21 ,x+x+y+y+y+y+y=27 ,x ,y=? y=x(x y+y+x=10,x+y+x=8,y=?,x=? 12y(x-y)^2-8(x-y)^3=? 已知x-y=8,（x+y)(x-y)=32,求x,y的值 X+Y-8X+10Y+41=O,求X/Y-Y/X的值 x+x+x+x+y+y+y=56 （x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? [(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=