已知x2+xy=3,xy+y2=2,则代数式x2+2xy+y2的值为多少?x2=x的2次方

已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2= 已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2. 已知x2+xy=3,y2+xy=-2,则2x2-xy-3y2=多少 若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? 已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值 已知X2次方+XY=3,XY+Y2次方=-2,求下例值:X2次方-Y2次方 已知X2次方+XY=3,XY+Y2次方=-2,求下例值:2X2次方-XY-3Y2次方 已知X2次方+XY=3,XY+Y2次方=-2,求下例值:X2次方+4XY+3Y2次方 已知x2+xy=3,xy+y2=2,则代数式x2+2xy+y2的值为多少?x2=x的2次方 已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2= x2+3xy+2y2=0,则x2+y2/xy (x2-2xy+y2)-(x2+2xy+y2)=什么 已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值 已知X2+y2=7,Xy=-2,求多项式5X2一3Xy-4y2-11Xy-7X2+2y2的值. 已知x2+y2 =7,xy=-2.求5x2 -3xy-4y2 -11xy-7x2 +2y2 x2-3y2=2xy过程 已知X/Y=2/7, 求X2-3XY+2Y2/2X2-3XY+7Y2的值 已知x/y=2/7,求分式(x2-3xy+2y2)/(x2-2xy+y2)的值