x^2+6xy+9y^2+3x+9y-4=0
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
x*-2xy+3y*=9 4x*-5xy+6y*=30
2 21.(2x+3y) -(x+2y) 2 2 2 22.3|x-3|+x -6xy+9y =0 则x y+2xy=?
已知:3x方+xy-2y方=0,求(x+y/x-y + 4xy/y方-x方)除以 x方+2xy-3y方 / x方-9y方
已知2x-3根号xy-2y=0(x>0),求x^2+4xy-16y^2/x^2+xy-9y^2
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知:x²-6xy+9y²=0,求代数式3x+5y/4x²-y²×(2x+y)的
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知x^2+9y^2-2x-6y+2=0,求{-(xy/(x-y)^2}^4*(y^2-xy/x)^3*x^4/y^10
4x^2+y^2-4x+6y+10=0,4x^2-12xy+9y^2
解方程组 x^2+2xy+y^2=9,(x-y)^2-4(x-y)+3=0