Bài 2.Tìm sốtựnhiên x, biết: a) xƯ(48) và x> 10 b) xƯ(18) và xB(3) c) xƯ(36) và 12x d) xB(12) và 30100x e) xƯ(28) và xƯ(21 f) 1 -xƯ(17) g) x-1 Ư(28) h) x+ 2 Ư(2x+ 5) i) 2x+3B(2x-1)

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