a: \(\left(-125\right)+100+80+125+20\)
\(=\left(-125+125\right)+100+\left(80+20\right)\)
=0+100+100
=200
b: \(27+55+\left(-17\right)+\left(-55\right)\)
\(=\left(27-17\right)+\left(55-55\right)\)
=10+0
=10
c: \(\left(-92\right)+\left(-251\right)+\left(-8\right)+251\)
\(=\left(-92-8\right)+\left(-251+251\right)\)
=-100+0
=-100
d: \(\left(-31\right)+\left(-95\right)+131+\left(-5\right)\)
\(=\left(-31+131\right)+\left(-95-5\right)\)
=100+(-100)
=0
e: \(A=5+\left(-18\right)+95+\left(-82\right)+100\)
\(=\left(5+95\right)+\left(-18-82\right)+100\)
=100-100+100
=100
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