y=x+4/x (x

x+x+x+y=60 .x-y=4 y=x+4/x (x y=|-x.x+4x+5| (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= y=x(x 7x:4y,x:y=( ):( (x-4y)(2x+y)= 5x-4y(y-x)=? x-y+5x-4x= ?x-y+5x-4x= ? x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? (x+y)(x^2+y^2)(x-y)(x^4+x^4)=? x/3=y/4,求(x*x-xy)/(x*x+y*y)的值 x+3y/y-x,其中x=-4, x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x(x-y)+4(y-x)因式分解 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1