Question

e qual e o valor da expressao (+1)+(+6)-(-2)+(-9)?

Answer 1

1+ 6 + 2 - 9
9- 9 = 0

Answer 2

( + 1 ) +  ( + 6 ) -  ( -  2 ) + ( - 9 ) =
7 - ( - 2 ) + ( - 9 ) =
9 + ( - 9 ) = 
= $\boxed{0}.$

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