\(a,\left(-214\right)+\left(-120\right)+\left(-16\right)\)

\(=\left[\left(-214\right)+\left(-16\right)\right]+\left(-120\right)\)

\(=\left(-230\right)+\left(-120\right)\)

\(=-350\)

\(b,12+5^{19}:5^{17}-3^2.2020^0\)

\(=12+5^2-9.1\)

\(=12+25-9\)

\(=28\)