算願:比を簡単にしよう1 なまえ . 12 : 4 =
12 : 6 = 12 : 20 = 12 : 9 = 20 : 12 = 10 : 20 = 15 : 12 = 4 : 16 = 10 : 5 = 8 : 16 = 5 : 20 = 10 : 2 = 3 : 15 = 10 : 2 = 12 : 6 = 2 : 8 = 8 : 16 = 8 : 6 = 9 : 15 = 4 : 12 = 4 : 6 = 15 : 9 = 10 : 2 = 12 : 16 = 12 : 6 =
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