2 3/10•а-1 2/3а при а=6

Question

2 3/10•а-1 2/3а при а=6

Answer 1

2 3/10а-1 2/3а=а*(2 3/10-1 2/3)=а*(23/10-5/3)=а*(69/30-50/30)=а*19/30=
=6*19/30=19/5=3 4/5