1.已知x^2+6xy+9y^2+|y-1|=0,则x+y=?
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
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/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知实数x满足x^2+2xy+y^2-(x+y)-6=0则x+y的值
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
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3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y