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Senior High
カピバラダンスᕕ😄ᕗ
カピバラダンスᕕ😄ᕗ

なぜDEはCD/√2で求められるんですか

15° A √3-1. 2 45° 1 √2 D E 45° C-1- B 6 45° √6-√2 2
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