已知x+y=-10,xy=16求x²+y²,(x-y)²,(x+2)(y+2),x
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x+y=-10,xy=16求x²+y²,(x-y)²,(x+2)(y+2),x
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知x+y=-10,xy=16求下列的值 ①x²+y² ②(x-y)² ③(x+2)(y+
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知y-2x=0,求代数式(x²-y²)(x²-xy+y²)/(x²+
已知x-3y=0,求2x+y/x²-2xy ×(x-y)的值
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x+y,且x²-2x=7,y²-2y=7求①x+y②2x+xy+y²