a festival in your country的翻译

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你们国家的一个节日

设A(x1,y1)，B（x2,y2）
x1²-y1²=1..........1
x2²-y2²=1............2
(x1 x2)/2=2 =>x1 x2=4
(y1 y2)/2=1 =>y1 y2=2
1-2=(x1 x2)(x1-x2)-(y1 y2)(y1 y2...

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设A(x1,y1)，B（x2,y2）
x1²-y1²=1..........1
x2²-y2²=1............2
(x1 x2)/2=2 =>x1 x2=4
(y1 y2)/2=1 =>y1 y2=2
1-2=(x1 x2)(x1-x2)-(y1 y2)(y1 y2)=0
4(x1-x2)-2(y1-y2)=0
直线AB的斜率K=(y1-y2)/(x1-x2)=2
所以直线AB的方程为：y-1=2(x-2)
y=2x-3
可以验算一下，
x²-（2x-3）²=1
-3x² 12x-10=0
x1 x2=12/3=4， (x1 x2）/2=2，正确

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你们国家的一个节日

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