Question

12+9-7-4+3-2+4. tinh nhanh

Answer 1

12+9-7-4+3-2+4

=(12+3)+(9-7-2)+(4-4)

=15+0+0

=15

Answer 2

\(=\left(12+3\right)+\left(9-7-2\right)+\left(4-4\right)=15+0+0=15\)

Answer 3

15

Answer 4

15

Answer 5

= 15

Answer 6

12

Answer 7

   12 + 9 - 7 - 4 + 3 - 2 + 4 

= ( 12 + 3 ) + ( 9 - 7 - 2 ) + ( 4 - 4 )

=      15      +         0         +       0

=                              15

Answer 8

15

Answer 9

  12 + 9 - 7 - 4 + 3 - 2 + 4

= (12 + 3 ) + ( 9 - 7 - 2 ) + ( 4 - 4 )

=     15      +        0         +      0

=                       15