Question

. Tính bằng cách hợp lí :

2 x 18 x 14 + 3 x 17 x12 + 4 x 69 x 9

Answer 1

2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9

= { 2 x 18 } x 14 + { 12 x 3 } x 17 + { 4 x 9 } x 69

= 36 x 14 + 36 x 17 + 36 x 69

= 36 x { 14 + 17 + 69 }

= 36 x 100

= 3600

Answer 2

2 × 18 × 14 + 3 × 17 × 12 + 4 × 69 × 9

= 2 × 18 × 14 + 3 × 12 × 17 + 4 × 9 × 69

= 36 × 14 + 36 × 17 + 36 × 69

= 36 × (14 + 17 + 69)

= 36 × 100

= 3600

Answer 3

2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9

= { 2 x 18 } x 14 + { 12 x 3 } x 17 + { 9 x 4 } x 69

= 36 x 14 + 36 x 17 + 36 x 69

= 36 x { 14 + 17 + 69 }

= 36 x 100

= 3 600 

Answer 4

= 3600