①X^2+y^2=1②X^2-3XY+2Y^2=0
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①X^2+y^2=1②X^2-3XY+2Y^2=0①X^2+y^2=1②X^2-3XY+2Y^2=0①X^2+y^2=1②X^2-3XY+2Y^2=0第2个方程可以分解因式:X^2-3XY+2Y^2=
①X^2+y^2=1②X^2-3XY+2Y^2=0
①X^2+y^2=1
②X^2-3XY+2Y^2=0
①X^2+y^2=1②X^2-3XY+2Y^2=0
第2个方程可以分解因式:
X^2-3XY+2Y^2=(X-Y)*(X-2Y)=0
那么得出:
X=Y………………3式
或
X=2Y……………4式
将3式带入1式得:
X^2+X ^2=1
2X^2=1
X=根2/2
将4式带入1式得:
X^2+(2X)^2=1
5X^2=1
X=根5/5
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