13A.Tìm cấc số tự nhiên x sao cho : a) x B (12) và 24 < x <80; b) x 13; 10< x <70; c) x Ư (48); x > 8; d) 35 x ; x ≤ 10; e) x BC (5,10,15); x < 100; f) x ƯC (20,30,40); x > 2. 13B. Tìm các Số tự nhiên x, sao cho: a) x B(15); 20 < x < 80; b) x 12; 10 < x < 64; c) x Ư (42); x > 4; d) 34 x; x 6; e) x BC (3,5,6); x < 80; f) x ƯC (12,16,20); x > 1. giúp em ạ!

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