解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..

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解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..解方程组：x2y2+x2+y2=9;x2y+xy

解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..
解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=3
2为平方,..

解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,..
x²y²+x²+y²=9
x²y²-2xy+1+x²+2xy+y²=10
(xy-1)²+(x+y)²=10
x²y+xy²-x-y=3
xy(x+y)-(x+y)=3
(x+y)(xy-1)=3>0
x+y与xy-1同号.
(x+y)²(xy-1)²=9
(x+y)²,(xy-1)²是方程m²-10m+9=0的两根.
m²-10m+9=0
(m-1)(m-9)=0
m=1或m=9
x+y=1 xy-1=3或x+y=-1 xy-1=-3
x+y=1 xy-1=3时,x+y=1 xy=4,x,y是方程m²-m+4=0的两根,方程无解.
x+y=-1 xy-1=-3时,x+y=-1 xy=-2 x,y是方程m²+m-2=0的两根.
m²+m-2=0
(m+1)(m-2)=0
m=-1或m=2
x=-1 y=2或x=2 y=-1.
综上,得
x=-1 y=2或x=2 y=-1.

解方程组：x2y2+x2+y2=9;x2y+xy2-x-y=32为平方,.. 因式分解x2y2-x2-y2+1 X2y2-x2-y2+1因式分解. (x2+y2)(x2-xy+y2)-2x2y2因式分解 x2+y2-x2y2-4xy-1 (x2+y2)2-4x2y2 因式分解因式分解(x2+y2-a2)2-4x2y2 4x2y2-(x2+y2)2的答案解方程组①x2-y2=3x+3y②x2-xy+y2=27 解方程组 x2 -2xy -y2 =1 2x2 -5xy -3y2 =0 解二元二次方程组｛4x2-y2=0 x2+xy-y2=-5 x2+y2=10 3x2+2xy-y2=0 解二元二次方程组解方程组 x2+2xy+y2-4=0 x2-2xy+y2-1=0 解方程组：｛x2+y2=13,x2-2xy+y2=1要完整过程！！！~~ x2+y2+x+y=18 x2+y2-2x-4x=24 解方程组解方程组x2+y2=20,2x2-3xy-2y2=o X2y2-x2-y2+1 =x2(y2-1)-(y2-1) =(y2-1)(x2-1) =(y+1)(y-1)(x+1)(x-1) 中的=x2(y2-1)-(y2-1) =(y2-1)(x2-1是怎么算出来的? 已知x2+4y2+x2y2+1=6xy,则(x4-y4)/(2x2+xy-y2)*(2x-y)/(xy-y2)/(x2+y2/y)2=