Question

(-10)-21-18

=................................

=...............................

Answer 1

\(\left(-10\right)-21-18\)
\(=\left(-10\right)-3\)
\(=-13\)

Answer 2

\(=-10-21-18\)
\(=-\left(10+21+18\right)\)
\(=-49\)

Answer 3

( - 10 ) - 21 - 18

= - ( 10 + 21 + 18 ) 

=    - 49

Answer 4

=-13

Answer 5

=-31-18

=-49