X2+Y2+XY=2,求X2+Y2-XY取值范围

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X2+Y2+XY=2,求X2+Y2-XY取值范围X2+Y2+XY=2,求X2+Y2-XY取值范围X2+Y2+XY=2,求X2+Y2-XY取值范围x^2+xy+y^2=2≥3xyxy≤2/3-2xy≥-

X2+Y2+XY=2,求X2+Y2-XY取值范围
X2+Y2+XY=2,求X2+Y2-XY取值范围

X2+Y2+XY=2,求X2+Y2-XY取值范围
x^2+xy+y^2=2 ≥3xy
xy ≤2/3
-2xy≥-4/3,
x^2-xy+y^2＝x^2+xy+y^2-2xy=2-2xy≥2/3
当且仅当 x=y时取等号

(x2-2xy+y2)-(x2+2xy+y2)=什么已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2. x2-y2=xy,xy不等于0求x2/y2=y2/x2 x2+xy+y2=19求x2+y2最小值若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? X2+Y2+XY=2,求X2+Y2-XY取值范围 (x2+xy+y2)-4xy(x2+y2) (x2+2xy+y2)( x2-xy+y2)2 化简 ( x2+xy+y2) ( x2+xy+2y2)-12y4 x2-2xy+y2-9 已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2= x2+y2+2xy=256 x2+y2-2xy=4 (x2, x2-3y2=2xy过程已知x2+y2+4x-2y+5=0,求x2+2xy+y2值已知x2+y2=2,求x2-2xy-y2的取值范围若X2+Y2-2X-6Y+10=0 ,求（x2-y2)/xy的值已知x2+y2=7,xy=-2,求5x2—3xy—4y2—11xy—7x2+2y2的值若3x2-4xy+y2=-3,2x2+3xy-2y2=8,求5x2-18xy+7y2的值.