Y-X=45 (85%Y-X)×8=(Y-35-X)×12 Y-X=45 (85%Y-X)×8=(Y-35-X)×12

Y-X=45 (85%Y-X)×8=(Y-35-X)×12 Y-X=45 (85%Y-X)×8=(Y-35-X)×12 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(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 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=? 【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=___ 12y(x-y)^2-8(x-y)^3=? y+y+x=10,x+y+x=8,y=?,x=? 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 y=x(x ：y' +y= cos x y= 微分方程y - 2y' + y = x 求y'=y/(y-x)