x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2

x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 1/x-1/y=3,求2x+3xy-2y/x-y 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? (1)x(x-1)-(x^2-y)=-2,求{(x^2)+(y^2)}/2-xy x(x-1)-(x平方-y）=-3,求x平方+y平方-2xy （1）正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y) 已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值 已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(xy+y)的值 4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值 x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y