Question

tinh nhanh:

7+(-12+43)-[7+(43-17)]

ai lam cho minh nhanh minh se tick cho

Answer 1

   7 + ( -12 + 43 ) - [ 7 + ( 43 - 17 ) ]

= 7 + ( -12 ) + 43 - [ 7 + 43 - 17 ]

= 7 + ( -12 ) + 43 - 7 - 43 +17

= ( 7 - 7 ) + ( 43 - 43 ) + [ ( -12 ) + 17 ]

=     0      +      0        +       5

=               5

Answer 2

7+(-12+43)-[7+(43-17)]

=7+(-12+43)-7-(43-17)

=7+(-12)+43-7-43+17

=(-12)+17

=5