x^+y^-6x-8y+25=0.求xy
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
帮个忙啦 已知x+y=-6 xy=8 求√y/x+√x/y
已知1/X^2 +1/Y^2 -6/X -8/Y +25=0求X+Y/XY的值
已知x的平方+y的平方-8x+6y+25=0,求【x-y+x-y分之4xy】乘【x+y-x+y分之4xy】的值
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)的值
实数x,y满足x²+y²+8x+6y+25=0,求x²+4xy+4y²分之x
已知x-xy=8,xy-y=-9,求x+y-2xy的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知x²+y²+8x+6y+25=0,求代数式(x²-4y/x²+4xy+4y&