X-Y=5,XY=3.XY是多少?

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X-Y=5,XY=3.XY是多少?
X-Y=5,XY=3.XY是多少?

X-Y=5,XY=3.XY是多少?
Y=X-5
XY=X²-5X=3
X²-5X-3=0
X=(5±√37)/2
Y=X-5
X=(5-√37)/2,Y=(-5-√37)/2
X=(5+√37)/2,Y=(-5+√37)/2

x=(5±√37)/2
y=(-5±√37)/2

x=y+5
（y+5）*y=3
（y+5/2）*（y+5/2)=3+25/4
Y=开平方（3+25/4)-5/2
x=5+Y

X=(5-√37)/2，Y=(-5-√37)/2
X=(5+√37)/2，Y=(-5+√37)/2

x=(5±√37)/2
y=(-5±√37)/2

X=(5-√37)/2，Y=(-5-√37)/2
X=(5+√37)/2，Y=(-5+√37)/2

x= , y=

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