\(a.267x46+267x54\) \(b.369x25+369x74+369\)
\(=267x\left(46+54\right)\) \(=369x\left(25+74+1\right)\)
\(=267x100=26700\) \(=369x100=36900\)
\(c.20x678x5\) \(d.25x8x125x4\)
\(=678x\left(20x5\right)\) \(=\left(25x4\right)x\left(125x8\right)\)
\(=678x100=67800\) \(=100x1000=100000\)