lim Σ (1/22)n = 0.999… T.theodor 2022.9.20.
ellipse ニ内接スル □ABCD 之 area ヲ求メヨ。 T.theodor 2022.9.20.
ellipse ニ内接スル △ABC 之 area ヲ求メヨ。 T.theodor 2022.9.20.
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