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由|x0-y0|/√2=√2得：|x0-y0|=2
①x0-y0=2 由x0²-y0²=1得
x0+y0=1/2
解得x0=5/4 y0=-3/4
②x0-y0=-2 由x0²-y0²=1
得x0+y0=-1/2
解得x0=-5/4 y0=3/4