x-y=12 5x-5y=( )

（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x x+y=5; x^y+y^x=17 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ (X-Y)(X+Y)=5 能解么 5x-4y(y-x)=? 解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 y-x=x-5 Y={X (-5 Y={X (-5 2(x-y)=5y,x-y=-5 x+y／y=5／4,则x／y=---------------- x-y=12 5x-5y=( ) x-y / 5y= (y-x)^2 / ( ) 已知：4x = 5y,求(x+y) ：y x*x+2x+y*y-4y+5=0 x= y=