已知x-y=2,x2-y2=6,则x= ___ ,y= ___ .
若x-y=2,x2-y2=10,则x+y= ___ .
已知:(x+y)2=1,(x-y)2=17,则x2+y2=___,xy=___.
已知正实数x,y满足x2+y2+xy=1,则x+y的最大值是___.
已知实数x,y满足方程(x2+2x+3)(3y2+2y+1)=43,则x+y= ___ .
已知实数x,y满足x2+4xy+4y2-x-2y+14=0,则x+2y的值为 ___ .
已知x2+y2=4,则2x+3y的取值范围 ⊙ ___ .
计算:(x2-2x+1-y2)÷(x+y-1)= ___ .
两圆x2+y2-10x-10y=0,x2+y2+6x-2y-40=0公共弦长为 ___ .
已知x+y=2,x-y=12,则分式2x2-2y2x2+2xy+y2的值是 ___ .
若x2+y2=1,则3x-4y的最大值是___.
若点P(x,y)满足x2+y2=25,则x+y的最大值是 ⊙ ___ .
已知x2+4x+y2-2y+5=0,则x2+y2=______.