1.解方程x^2+y^2=4 xy-y^2+4=0 2.3x^2-y^2=8 x^2+xy+y^2=4
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1.解方程x^2+y^2=4 xy-y^2+4=0 2.3x^2-y^2=8 x^2+xy+y^2=4
2.3x^2-y^2=8 x^2+xy+y^2=4 1.解方程x^2+y^2=4 xy-y^2+4=0
2.3x^2-y^2=8 x^2+xy+y^2=4 1.解方程x^2+y^2=4 xy-y^2+4=0
1、x²+y²=4
xy-y²+4=0由此式可得:xy-y²=-4与上式相加可得:
x²+xy=0 x(x-y)=0 x=0或x=y
x=0则y=±2
x=y则y=±√2=x
2、3x²-y²=8
x²+xy+y²=4此式乘以2减去上式可得:
-x²+2xy+3y²=0
(y+x)(3y-x)=0
y=-x或x=3y
当y=-x时
2y²=8
y²=4
y=±2 x=±2
当x=3y时
26y²=8
y=±2√13/13
x=±6√13/13
xy-y²+4=0由此式可得:xy-y²=-4与上式相加可得:
x²+xy=0 x(x-y)=0 x=0或x=y
x=0则y=±2
x=y则y=±√2=x
2、3x²-y²=8
x²+xy+y²=4此式乘以2减去上式可得:
-x²+2xy+3y²=0
(y+x)(3y-x)=0
y=-x或x=3y
当y=-x时
2y²=8
y²=4
y=±2 x=±2
当x=3y时
26y²=8
y=±2√13/13
x=±6√13/13
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