x2-3xy+2y2=0 3x2+2xy=20 解二元二次方程组

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x2-3xy+2y2=03x2+2xy=20解二元二次方程组x2-3xy+2y2=03x2+2xy=20解二元二次方程组x2-3xy+2y2=03x2+2xy=20解二元二次方程组x2-3xy+2y2

x2-3xy+2y2=0 3x2+2xy=20 解二元二次方程组
x2-3xy+2y2=0 3x2+2xy=20 解二元二次方程组

x2-3xy+2y2=0
:(x-y)^2-y(x-y)=0
(x-y)(x-2y)=0
3x2+2xy=20
若x=y,时：x=y=2或-2
若x=2y时：x=正负根号5，y=2倍正负根号5
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x2-3xy+2y2=0
:(x-y)^2-y(x-y)=0
(x-y)(x-2y)=0
3x2+2xy=20
若x=y,时：x=y=2或-2
若x=2y时：x=正负根号5，y=2倍正负根号5

若X2+xy-2y2=0,则（x2+3xy+y2)/x2+y2=? 解方程组 x2 -2xy -y2 =1 2x2 -5xy -3y2 =0 x2+3xy+2y2=0,则x2+y2/xy 已知x2+xy=3,xy+y2=-2,则2x2-xy-3y2= 已知x2-3xy=-5,xy+y2=3,求x2-2xy+y2. x2-3y2=2xy过程 2(x2-xy)-3(2x2-3xy)-2[x2-(2x2-xy+y2)] 化简. 求证:(x2-xy+y2)3+(x2+xy+y2)3能被2x2+2y2整除 4x2-3y2+2xy-4x2+5x2 已知X2次方+XY=3,XY+Y2次方=-2,求下例值:X2次方-Y2次方 (x2-2xy+y2)-(x2+2xy+y2)=什么如果x2+y2=5,那么代数式(3x2-2xy-y2)-(x2-2xy-3y2)的值为 2(x-xy)-3(2x2-3xy）2[x2（2x2-xy+y2)] 2x2-3xy-2y2=0 x2+y2=5 x2+y2=10 3x2+2xy-y2=0 解二元二次方程组解方程组 x2 -2xy -y2 =1 2x2 -5xy -3y2 =0解方程组 x2 -2xy -y2 =12x2 -5xy -3y2 =0 (3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y) 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