2) Efetue as adiçoes algebricas
a)+1 - (+2) + (-2) + (-3) - (+2) + (+7)
b) -7 + (-3) - (+9 ) + (+6) - (+10) + (+7)
c) +15 + (+7) + (-16) + (-9) + (-7) + (-6)
d) +12 + (+15) - (+20) + (-15) - (+18) + (+22)
e) -100 + (-10) - (+5) + (+4) - (+6) - (-7)
f) -3 + (-4) - (-8) + (-9) - (-7) + (-5) - (+8) + ( - 8)
g) + (-100) + (+200) - (+20) + (-40) - (+30) + (-60) - (-10) - (+4) - (+1)
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