急实数XY满足(x2+y2)2+(x2+y2)-6=0则x2+y2等于 A-3 B2 c2或-3 D3或-2

急实数XY满足(x2+y2)2+(x2+y2)-6=0则x2+y2等于 A-3 B2 c2或-3 D3或-2 已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值 已知非零实数x,y满足:x2+xy-2y2=0,求(x2+3y+y2)/(x2+y2)的值 实数x,y满足3x2+2y2=6x,求x2+y2的最大值急 若实数XY满足X2+Y2=1,则X-2Y的最大值为 已知实数x、y满足2x2-7xy+3y2=0,求x：y 已知实数x.y满足（x2+y2）（x2+y2-1）=2,求x2+y2的值 实数xy满足x2+y2+2x-4y+1=0,则x2+y2-2x+1的最小值为 实数xy满足x2+y2+2x-4y+1=0,则（根号下x2+y2-2x+1）的最大值为 在实数范围内因式分解x2+y2-1-2xy 若实数xy满足x2+y2=4求xy的最值 (x2+2xy+y2)( x2-xy+y2)2 化简 (x2-2xy+y2)-(x2+2xy+y2)=什么 ( x2+xy+y2) ( x2+xy+2y2)-12y4 已知非零实数x,y满足等式x2-xy-2y2=0 ,快来看看!已知非零实数x,y满足等式x2-xy-2y2=0,求x2+3xy+y2/x2+y2其中,字母后面的2表示平方 x2-2xy+y2-9 已知实数x,y满足x2＋y2=4,则2xy/x＋y-2的最小值为? 若实数x,y满足x2+y2+x2y2-4xy+1=0,则(x+y)2的值为