Tính bằng cách thuận tiện.

a) 3 506 × 25 × 4

b) 467 × 46 + 467 × 54

a) 3 506 × 25 × 4 = 3 506 × (25 × 4)

                           = 3 506 × 100

                           = 350 600

b) 467 × 46 + 467 × 54 = 467 × (46 + 54)

                                     = 467 × 100

                                     = 46 700