Resolva as expressões numéricas com números inteiros.

a) +25 -10 +45 +12 -50=
b) +100 -500 +450 -325 + 55=
c) -(+5) + (+10) - (-2) + (-15)=
d) (-12) - (-13) + (-14) - (+15) + (-16)=
e) (-10) - (+9) + (+8) + (-7) - (+6)=
f) (+8-7) - (-5÷4) + (-6+5)=​
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