Question

a)Enumerati elementele multimii A={x ∈ N , x=ab,3|x si 10 | x }

b)Scrieti numerele naturale divizibile cu 3 de forma :
1a , a5 , 36ab , 4a9b , 1ab7 (toate au o linie sus )

Answer 1

a) x=30,60,90
b) 15, 18,15,45,75,3606,3609,3618,3624,3627,3636,3639,3642,3645,3648,3651,3654,3657,3660,3663,3669,4092,4095,4098,4194,4197,4290,4293,4295,4298,4392,4395,4398,4491,4497,4590,4593,4596,4599,4692,4695,4698,4791, 4794,4797,4890,4893,4896,4899,4992,4995,4998,1017,1047,1077,1107,1137,1167,1197,1257,1287,1317,1347,1377,1407,1437,1467,1497,1527,1587,1617,1647,1677,1707,1737,1767,1797,1827,1857,1917,1947,1977