Question

Tính nhanh

45 - 5 . ( 12 + 9 )

Answer 1

45 - 5. ( 12 + 9 ) 

= 45 - 5 . 9 + 12 . 5

= 45 - 45 - 60

= 0 - 60

= -60

Answer 2

   45 - 5 . ( 12 + 9 )

= 45 - 5 . 9 + 5 x 12

= 45 - 45 + 60

= 0 + 60

= 60

Answer 3

45 - 5 . ( 12 + 9 )

= 45 - 5 x 21

= 45 - 105

= - 60

 Đoán vậy

Tk mk nha

Answer 4

45 - 5 x ( 12 + 9 )

= 45 - 5 x 9  + 5 x 12

= 45 - 45 + 60

= 0 + 60

= 60

Answer 5

45 - 5 . (12 + 9)

=45 - 5 . 12 + 5 . 9

=45 - 60 - 45

= 45 - 45 - 60

= 0 - 60

= - 60

Answer 6

\(45-5.\left(12+9\right)\)

\(=45-\left[\left(5.12\right)+\left(5.9\right)\right]\)

\(=45-\left[60+45\right]\)

\(=45-105\)

\(=-60\)

Answer 7

45 - 5 ( 12 + 9 )

= 45 - 5 * 21

= 45 - 105

= - 60