4x^2+y^2+4xy+12x-6y+9=0
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
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
x*-2xy+3y*=9 4x*-5xy+6y*=30
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
已知x^2+y^2-4x+6y+13=0求(xy+y^2/5x^2-5xy+xy+y^2)·(5/x+y)-(y/x-y
已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的
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