解方程x^2+xy+y^2-3x-3y+3=0
怎么解方程 x+y=2 xy=-3
解方程x+xy+y=2+3√2,x^2+y^2=6
解方程:(x^2+1)(y^2+1)=10 (x+y)(xy-1)=3
求方程(x+y)/(x^2-xy+y^2)=3/7的整数解
求方程(x+y)/(x^2-xy+y^2)=3/7的整数解
实数x,y满足方程x^2-3xy+3y^2+4x-18y+52=0
化简分式方程:x*x-xy-y*y/x*x-3x-6y+2xy
已知3x-y+2z=x+2y+3z=0,求(3x^-xy+2y^)/(2x^+4xy+y^)值?
求方程2x^2-xy-3x+y+2008=0的正整数解
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)}
解方程(1)x^2+2xy+y^2-4x-4y=5,x^2-2xy+y^2-2x+2y=3 (2) xy+x+y=34,