Question

Resolva:
( - 100 ) + ( - 800 ) - ( - 549 ) + ( - 348 ) + ( 987 )
( + 9181 ) - ( + 898 ) - ( + 550 ) - ( + 991 ) - ( 1490 )

Answer 1

Resposta :                                                                                                                  ( - 100 ) + ( - 800 ) - ( - 549 ) + ( - 348 ) + ( 987 )

( - 100 ) - 800 - ( - 549 ) + ( - 348 ) + ( 987 )

- 900 - ( - 549 ) + ( - 348 ) + ( 987 )

- 900 + 549 + ( - 348 ) + ( 987 )

- 351 + ( - 348 ) + ( 987 )

- 351 - 348 + ( 987 )

- 699 + ( 987 )

288

( + 9181 ) - ( + 898 ) - ( + 550 ) - ( + 991 ) - ( 1490 )

8283 - ( 550 ) - ( 991 ) - ( 1490 )

7733 - ( 991 ) - ( 1490 )

6742 - ( 1490 )

5252          

Answer 2

Resposta:

> regra de sinais:

( + ) com ( + ) = ( + )

( - ) com ( - ) = ( + )

( - ) com ( + ) = ( - )

( + ) com ( - ) = ( - )

--------------------------

> ( - 100 ) + ( - 800 ) - ( - 549 ) + ( - 348 ) + ( 987 )

= ( - 100 ) - 800 - ( - 549 ) + ( - 348 ) + ( 987 )

= - 900 - ( - 549 ) + ( - 348 ) + ( 987 )

= - 900 + 549 + ( - 348 ) + ( 987 )

= - 351 + ( - 348 ) + ( 987 )

= - 351 - 348 + ( 987 )

= - 699 + ( 987 )

= + 288

> ( + 9181 ) - ( + 898 ) - ( + 550 ) - ( + 991 ) - ( 1490 )

= 8283 - ( 550 ) - ( 991 ) - ( 1490 )

= 7733 - ( 991 ) - ( 1490 )

= 6742 - ( 1490 )

= + 5252