Question

expresa como un producto de numeros primos los siguientes numeros
a)18 b)20 c)21 d)48 e)128 f)60

Answer 1

18 | 2                      20 | 2                     21 | 3
  9 | 3                      10 | 2                       7 | 7
  3 | 3                        5 | 5

18= 2 * 3²               20 = 2² * 5             21 = 3 * 7

48 | 2                     128 | 2                   60 | 2
24 | 2                       64 | 2                   30 | 2
12 | 2                       32 | 2                   15 | 3
  6 | 2                       16 | 2                     5 | 5
  3 | 3                         8 | 2
                                  4 | 2
                                   2| 2

48= 2⁴ * 3                128 = 2⁷               60 = 2² * 3 * 5