x^2+6xy+9y^2-4x-12y+4
4x^2y+12xy+9y
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x*-2xy+3y*=9 4x*-5xy+6y*=30
x^2y+4xy+4y
4x^2+y^2-4x+6y+10=0,4x^2-12xy+9y^2
已知4x^2+y^2-4xy-12x+6y+9=0,求x,y的关系
分解因式4x^2-12xy+9y^2-2x+3y-6
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值