Question

Tính ( 13 - 135 + 49 ) - ( 13 + 49 ) = ?

Answer 1

( 13 - 135 + 49 ) - ( 13 + 49 )

= 13 - 135 + 49 - 13 - 49

= ( 13 -13 ) + ( 49 - 49 ) - 135

= 0 + 0 - 135

= -135

 

Answer 2

( 13 - 135 + 49 ) - ( 13 + 49 )

= 13 - 135 + 49 - 13 - 49

= ( 13 -13 ) + ( 49 - 49 ) - 135

= 0 + 0 - 135

= -135

Answer 3

 (13-135+49)-(13+49)

=13-135+49-13-49

=-135