若x-y=2,x2-y2=10,则4x+6等于( )
已知x2-y2=6,x-y=1,则x+y等于( )
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
若4x-3y-6z=0,x+2y-7z=0(xyz≠0),则5x2+2y2−z22x2−3y2−10z2的值等于( )
若实数x,y满足3x2+2y2=6x,则x2+y2的最大值为______.
实数x、y满足3x2+2y2=6x,则x2+y2的最大值为( )
已知x2-5xy+6y2=0,则y:x等于( )
若x2+4y2=(x+2y)2+A=(x-2y)2+B,则A,B各等于( )
已知x2+4x+y2-2y+5=0,则x2+y2=______.
已知x+y=2,则12x2+xy+12y2等于( )
X2+Y2+8X+6Y+25=0 求代数式(x2-4y2/x2+4xy+4y2)-x/x+2y
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
若x-y=2,x2-y2=10,则x+y= ___ .