已知x+y=6,xy=8,则当x
已知x+y=6,xy=8,则当x
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
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+y=6,xy=-3,则x^2y+xy^2=?
已知x+y=6,xy=-3,则x^2y+xy^2=
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知当x=8,y=18,求(x+y)/(根号x-根号y)-(2xy)/(x根号y-y根号x)
帮个忙啦 已知x+y=-6 xy=8 求√y/x+√x/y
已知x^2+y^2-6x-8y+25=0,则xy=
已知x²-6xy+8y²=0(xy≠0),则求x/y的值
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?