\(\left(792,81\cdot0,25+792,81\cdot0,75\right)\cdot\left(11\cdot9-900\cdot0,1-9\right)\)
\(=792,81\cdot\left(0,25+0,75\right)\cdot\left(11\cdot9-9\cdot10-9\right)\)
\(=792,81\cdot1\cdot9\cdot\left(11-10-1\right)\)
\(=792,81\cdot9\cdot0\\ =0\)
\(\left(792,81\times0,25+792,81\times0,75\right)\times\left(11\times9-900\times0,1-9\right)\\ =\left[792,81\times\left(0,25+0,75\right)\right]\times\left(99-90-9\right)\\ =\left(792,81\times1\right)\times\left(9-9\right)\\ =792,81\times0\\ =0\)
\( (792,81.0,25+792,81.0,75).(11.9-900.0,1-9)\)
\(=[792,81.(0,25+0,75)].(99-90-9) \)
\(=792,81.1.0\)
\(=792,81.0\)
\(=0\)
