Question

Tính bằng cách thuận  tiện:

a) 4x9120x25

b) 15 800 + 4 200+ 7 260+ 2 740

 

Answer 1

a) 4 x 9120 x 25

= 25 x 4 x 9120

= 100 x 9120

= 912000

b) 15 800 + 4 200 + 7 260 + 2 740

= (15800 + 4200) + (7260 + 2740)

= 20000 + 10000

= 30000

Answer 2

a) 4 x 9120 x 25

= 25 x 4 x 9120

= 100 x 9120

= 912000

b) 15 800 + 4 200 + 7 260 + 2 740

= (15800 + 4200) + (7260 + 2740)

= 20000 + 10000

= 30000