c: \(98\cdot42-50\cdot\left\lbrack\left(18-2^3\right):2+3^2\right\rbrack\)
\(=98\cdot42-50\cdot\left\lbrack\left(18-8\right):2+9\right\rbrack\)
\(=98\cdot42-50\cdot\left\lbrack10:2+9\right\rbrack\)
\(=98\cdot42-50\cdot14=3416\)
d: \(407-\left\lbrack\left(190-170\right):4+9\right\rbrack:2\)
=407-[20:4+9]:2
=407-14:2
=407-7
=400
e: \(\left(23\cdot36-17\cdot36\right):36\)
\(=36\cdot\frac{\left(23-17\right)}{36}\)
=23-17
=6
f: \(3\cdot5^2-27:3^2+5^2\cdot4-18:3^2\)
\(=3\cdot25-27:9+25\cdot4-18:9\)
=75-3+100-2
=175-5
=170
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