вычислите(1/3+0,5)*2 2/5-(1/2-0,3)*3,5

1,3

=(1/3+5/10)*12/5-(1/2-3/10)*7/2==(10/30+15/30)*12/5-(5/10-3/10)*7/2==25/30*12/5-2/10*7/2==5/6*12/5-1/5*7/2==2-7/10==20/10-7/10==13/10==1 3/10