1 3/5*8+2.9*5=


7.5*1/3-0.5=

1 3/5*8+2.9*5=8/5*8+14,5=64/5+145/10=128/10+145/10=273/10=27,37.5*1/3-0.5=7 5/10*1/3-5/10=75/10*1/3-5/10=75/30-15/30=60/30=2