Tính (theo mẫu).

Mẫu: 26 × 4 + 26 × 3 + 26 × 2

 26 × 4 + 26 × 3 + 26 × 2 = 26 × (4 + 3 + 2)

                                        = 26 × 9

                                        = 234

321 × 3 + 321 × 5 + 321 × 2

321 × 3 + 321 × 5 + 321 × 2 = 321 × (3 + 5 + 2)

                                             = 321 × 10

                                             = 3 210