若(x-y)(x+y)=5 ,(x+y)的二次方=4试求x-y

若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 （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 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 化简 x / y(x+y) - y / x(x+y) = 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) x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 若3x=5y,则x:y=________,(x-y):y=______ 若D={(X,Y)||X|+|Y| (X-Y)(X+Y)=5 能解么 5x-4y(y-x)=? {(x,y) |x|+|y| x>y?x:y 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值