5 целых 1/8 + 4 целых 3/4
11 целых 6/10 - 10 целых 2/5
3/8*40
1/10:8

5 1/8+4 3/4=(5+4)+(1/8+3/4)=9+(1/8+6/8)=9+7/8=9 7/811 6/10-10 2/5=(11-10)+(6/10-2/5)=1+(6/10-4/10)=1+2/10=1 2/10=1 1/53/8*40=(3*40)/8=(3*5*8)/8=3*5=151/10:8=1/10*1/8=(1*1)/(10*8)=1/80