x^2+y^2=20 x^2-3xy+2y^2=0
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x^2+y^2=20x^2-3xy+2y^2=0x^2+y^2=20x^2-3xy+2y^2=0x^2+y^2=20x^2-3xy+2y^2=0x²-3xy+2y²=0(x-2y)
x^2+y^2=20 x^2-3xy+2y^2=0
x^2+y^2=20 x^2-3xy+2y^2=0
x^2+y^2=20 x^2-3xy+2y^2=0
x²-3xy+2y²=0
(x-2y)(x-y)=0
x=2y 或x=y
若x=2y
x²+y²=20
4y²+y²=20
5y²=20
y²=4
y=±2 x=±1
若 x=y
x²+y²=20
x²+x²=20
x²=10
x=±根号下10 y=±根号下10
所以x=1 y=2 或x=-1 y=-2 或x=根号下10 y=根号下10 或x=-根号下10 y=-根号下10
（-3x^y+2xy)-( )=4x^+xy
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x+y=-3 xy+x+y=-2 x/y+y/x=?
x-y/xy=( )/x^3y^2
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