x2+3xy+2y2=0,则x2+y2/xy

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x2+3xy+2y2=0,则x2+y2/xy
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x2+3xy+2y2=0,则x2+y2/xy
x2+3xy+2y2=0,则x2+y2/xy

x2+3xy+2y2=0,则x2+y2/xy

x²+3xy+2y²=0
(x+y)(x+2y)=0
x=-y或x=-2y
(x²+y²)/xy
=2y²/-y²
=-2
或
(x²+y²)/xy
=5y²/(-2y²)
=-5/2
(x²+y²)/xy的值为-2或-5/2

若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? x2+3xy+2y2=0,则x2+y2/xy 已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2= 解方程组 x2 -2xy -y2 =1 2x2 -5xy -3y2 =0 若x不等于0是x2+xy-2y2=0,则x2+3xy+y2/x2+y2=急!详细!10分钟哦! (x2-2xy+y2)-(x2+2xy+y2)=什么 若3x2-xy+3y2=0 ,则8x2+23y2 的最大值是 2x2-3xy-2y2=0 x2+y2=5 x2+y2=10 3x2+2xy-y2=0 解二元二次方程组 x的平方+ xy-2y的平方=0,则(X2+3Xy+Y2)/(X2+Y2)=__x的平方+ xy-2y的平方=0,则(X2+3Xy+Y2)/(X2+Y2)=__其中(X2+3Xy+Y2)/(X2+Y2)=__的2为平方 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 x2-3y2=2xy过程 已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2. 解方程组 ｛3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方 还有{2x-3y=12x2-3xy+y2-4x+3y-3=0 如果x2+y2=5,那么代数式(3x2-2xy-y2)-(x2-2xy-3y2)的值为 x2-y2=xy,xy不等于0求x2/y2=y2/x2 求证:(x2-xy+y2)3+(x2+xy+y2)3能被2x2+2y2整除 已知x2+xy=3,y2+xy=-2,则2x2-xy-3y2=多少