(-134) + 51 . 134 + (-134) . 48
= (-134) . (1 - 51 + 48)
= (-134) . (-2)
= 268
\(=\left(-134\right)\left(1+48\right)+51.134=\left(-1\right).134.49+51.134=134\left(-49+51\right)=134.2=268\)
\(\left(-134\right)+51.134+\left(-134\right).48\)
\(=\left(-134\right)+51.134-134.48\)
\(=134\left(-1+51-48\right)\)
\(=134.2\)
\(=268\)