算願:比を簡単にしよう1 なまえ . 15 : 3 =
20 : 4 = 4 : 6 = 8 : 16 = 15 : 9 = 12 : 16 = 15 : 10 = 4 : 8 = 6 : 8 = 15 : 9 = 16 : 4 = 15 : 25 = 8 : 6 = 9 : 3 = 16 : 20 = 10 : 15 = 10 : 6 = 12 : 4 = 4 : 8 = 12 : 6 = 16 : 12 = 9 : 12 = 8 : 20 = 15 : 12 = 12 : 8 =
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