Question

3) Calcule as somas algébricas:
a) 140 + 30 – 72 – 58
b) (-5) – (-2) + (+4) – (+8)=
c) 50 – (+14 – (-20)=
d) (28-2) – (15 + 10) -6=


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Answer 1

${a)140 + 30 - 72 - 58} \\ {170 - 72 - 58} \\ {170 - 130} \\ \large \boxed{ \red{{40}}}$

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${b)( - 5) - ( - 2) + ( + 4) - ( +8) } \\ - 5 - ( - 2) + 4 - 8 \\ - 5 + 2 + 4 - 8 \\ - 13 + 6 \\ \large \boxed{ \red{{ - 7}}}$

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${c)50 - ( + 14) - ( - 20)} \\ 50 - 14 + 20 \\ 70 - 14 \\ \large \boxed{ \red{{56}}}$

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$d)( 28 - 2) - (15 + 10) - 6 \\ 26 - (15 + 10) - 6 \\ 26 - 25 - 6 \\ 26 - 31 \\ \large \boxed{ \red{{ - 5}}}$

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Att, IzabelaCristina2006 ❤️ ♈