Question

2/3(6.9с-1 1/2д)-4.8(5/8с-2.5д)

Answer 1

2/3(6.9*ц-1 целая1/2д) -4,8*(5/8*С-2,5д) = (2/3*69/10ц-2/3*3/2д) - 48/10*5/8с-48/10*25/10д) =23/5с-д) -(3с-12д) =23/5с-д-3с+12д = 4.6с-3с- д+12д = 1.6с+11д