Question

Tính nhanh:

a) 5. 9. 3. 2 b) 25. 5. 4. 27. 2

Answer 1

a) \(5.9.3.2=\left(5.2\right)\left(9.3\right)=10.27=270.\)

b) \(25.5.4.27.2=\left(25.4\right)\left(5.2\right).27=100.10.27=1000.27=27000.\)

Answer 2

a) 5 . 9 . 3 . 2

= (5 . 2) . (9 . 3)

= 10 . 27

= 270

b) 25 . 5 . 4 . 27 . 2

= (25 . 4) . (5 . 2) . 27

= 100 . 10 . 27

= 27000

Answer 3

a, 5 . 9 . 3 . 2

= ( 5 . 2 ) . 9 . 3

= 10 . 27

= 270

b, 25 . 5. 4 . 27 .2

= ( 25 . 4 ) . ( 5 .2 ) . 27

= 100 . 10 . 27

= 1000 . 27 = 27000