tentukan fpb dan kpk dalam bentuk faktorisasi prima 18,36,45

              18                    36                         45
                ^                      ^                           ^
              2  9                  2  18                     3  15
                  ^                        ^                           ^
                3  3                    2  9                       3  5
                                               ^
                                             3  3

FPB = 3² = 9
KPK = 2² x 3² x 5
        = 180