361,62*100+1848:100=36162+18,48=36180,48
2 1/2=2 5/10= 2 50/100
3 1/4=3 25/100
1 7/20= 1 35/100
4 4/25 = 4 16/100
А) 3/2+(2 1/4- 1 1/2), = 3/2 + (2 1/4 - 1 2/4) = 3/2 + (1 5/4 - 1 2/4) = 3/2 + 3/4 = 6/4 + 3/4 = 9/4 = 2 1/4
б) 2,6- 1 2/7 = 2 6/10 - 1 2/7 = 2 3/5 - 1 2/7 = 2 21/35 - 1 10/35 = 1 11/35