1.3/5*8+2,9*5 дробная черта7,5*1/3-0,5

= (13/10*8/5 + 14,5)/ (75/10*1/3 - 0,5)= (13*8/10*5 + 14,5) / (75/30 - 5/10)= (104/50+145/100) / (75/30 - 15/30)= (104*2+145/100) / 60/30= 353/100 / 30= 353/100*1/30= 353/3000