Tính bằng cách thuận tiện a) 158 × 36 + 36 + 267 + 36 × 305 + 270 × 36

a) 158 × 36 + 36 + 267 + 36 × 305 + 270 × 36

= 36 × (158 + 267 + 305 + 270)

= 36 × 1 000

= 36 000

b) 426 × 49 + 49 × 574 + 51 × 623 + 377 × 51

= 49 × (426 + 574) + 51 × (623 + 377)

= 49 × 1 000 + 51 × 1 000

= 1 000 × (49 + 51)

= 1 000 × 100

= 100 000

c) 5 × 125 × 20 × 8

= (5 × 20) × (125 × 8)

= 100 × 1 000

= 100 000

d) 11 × 21 + 32 × 11 + 54 × 11

= 11 × (21 + 32 + 54)

= 11 × 107

= 1 177

e) 4 × 5 × 125 × 2 × 25 × 8

= (4 × 25) × (5 × 2) × (125 × 8)

= 100 × 10 × 1 000

= 1 000 000