已知2x^2+6x+y^2=2xy-9,求x^y

已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy 已知x-xy=8,xy-y=-9,求x+y-2xy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xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值. 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方 已知X+y=6,xy=7 求x^2y+xy^2= 初中数学分式已知x/y=2,求（x*x-xy+3y*y）/x*x+xy+6y*y的值 已知xy=2,x-y=3,求（x+y）（x-y）-y^2-（6x^2y-2xy^2)/2y的值.