、 = lim Σ 1/k − lim ln(n) ( n→∞) = − ∞ T.theodor 2022.8.31
任意之 line l ト △ABC ニ於イテ、line l ト line BC、CA、AB ノ交点ヲ D、E、F トシ、□FBCE ガ circle ニ内接スル。 AF/FB・DE/DF・CE/EA = (AF/bFB) 2・BD/DC = (CE/bEA) 2・BD/DC = 1 T.theodor 2022.8.30
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