Question

Câu 2: Thực hiện phép tính:

a) 18 + 36 : 3\(^2\)

b) 2\(^3\) . 81 + 2\(^3\) . /-19/

c) 2\(^3\) . 5 - [ 6\(^2\) : 4 + 3 . ( 2\(^3\) - 5) ]

Answer 1

a) 18 + 36 : 3²

= 18 + 36 : 9

= 18 + 4

= 22

b) 2³ . 81 + 2³ . |-19|

= 2^3 . 81 + 2^3 . 19

= 2^3 ( 81 + 19 )

= 2^3 . 100

= 8 . 100

= 800

c) 2^3 . 5 - [ 6^2 : 4 + 3 ( 2^3 - 5 )]

= 8 . 5 - [ 36 : 4 + 3 ( 8 - 5 )]

= 40 - ( 36 : 4 + 3 . 3 )

= 40 - ( 9 + 9 )

= 40 - 18

= 22

Answer 2

a,18+36:3²

=18+36:9

=18+4

=22

Answer 3

b,2³.81+2³. /-19/

=8.81+8. 19

=8(81+19)

=8.100

=800

 

Answer 4

c,2³.5-[6²:4+3.(2³-5)]

=8.5-[36:4+3.(8-5)

=40-[6+3.3]

=40-[6+9]

=40-15

=25

Answer 5

mk làm lại câu c nhé :

c,2³.5-[6²:4+3.(2³-5)]

=8.5-[36:4+3.(8-5)]

=40-[9+3.3]

=40-[9+9]

=40-18

=22