Trl:
\(\left(-4\right)\times\left(+125\right)\times\left(-25\right)\times\left(-6\right)\times\left(-8\right)\)
\(=\left[\left(-4\right)\times\left(-25\right)\right]\times\left[\left(+125\right)\times\left(-8\right)\right]\times\left(-6\right)\)
\(=100\times\left(-1000\right)\times\left(-6\right)\)
\(=\left(-100000\right)\times\left(-6\right)\)
\(=600000\)