2x-3=y xy=209 求x y分别是多少
已知|x-2y|+(x+y)²=0,xy分别是多少?
已知x+y=3 xy=2 则多项式-x²y-xy²的值是多少求计算方法
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
2y+3x=2XY(X>0,Y>0)的XY的最小值是多少
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.
已知xy/x+y=3,求2x-3xy+2y/-x+3xy-y的值
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
已知x-y/xy=3,求分式2x+3xy-2y/x-2xy-y的值.