1)a = 2 * 3 * 5 и b = 2 * 2 * 3 * 5
2)a = 2 * 3 * 3 * 5 = b = 2 * 3 * 3 * 7
3)a = 2 * 3 * 5 * 5 и b = 3 * 3 * 5 * 5

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