Question

Giải bài sau:

Tính nhanh

a) 23 + 47 + 11 + 29

b)4.7.11.25

c) 18 + 15 + 22 + 45

d) 276 + 118 + 324

e) 5.9. 3. 2

g) 255. 4. 27. 2

Answer 1

a) 23 + 47 + 11 + 29

= ( 23 + 47 ) + ( 11 + 29 )

= 70 + 40

= 110

b)4.7.11.25

= (4.25) . ( 7.11)

= 100 . 77

= 7700

c) 18 + 15 + 22 + 45

= ( 18 + 22 ) + ( 15 + 45 )

= 40 + 60

=100

Answer 2

d) 276 + 118 + 324

= (276 + 324 ) + 118

= 600

e) 5.9. 3. 2

= (5.2 ) ( 9.3)

=10 . 18

=180