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B(1,1) 設正方形ADEF邊長為n 則E(1+n,n)在Y=1/X上 即(1+n)n=1 n^2+n-1=0 用求根公式得 a=(-1+√5)/2(因為a>0) E的座標是((1+√5)/2,(-1+√5)/2)
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