Question

2. Calcula:

· [(+10) + (-7)] + (- 8) =

· [(-18) + (+3)] + (+7) =

. [(-20) + (+8)] + (+13) =

.[(+18) + (-13)] + (-16) =

· [(+23) + (-18)] + (-19) =

· [(-31) + (+12)] + (+15) =

· [(+25) + (-15)] + (-18) =​

Answer 1

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