4 2/5:(1 1/2-2/5)+(3/4+5/6):4 3/4

4 2/5 : (1 1/2 - 2/5) + (3/4 + 5/6) : 4 3/4 = 4 целых 1/31) 1 1/2 - 2/5 = 1 5/10 - 4/10 = 1 1/102) 4 2/5 : 1 1/10 = 22/5 : 11/10 = 22/5 * 10/11 = (2*2)/(1*1) = 43) 3/4 + 5/6 = 9/12 + 10/12 = 19/124) 19/12 : 4 3/4 = 19/12 : 19/4 = 19/12 * 4/19 = (1*1)/(3*1) = 1/35) 4 + 1/3 = 4 1/3