A) (1 - 1/2) : (1/2 - 1/3) = 1/2 : (3-2)/6 = 1/2 : 1/6 = 6/2 = 3
б) (4/9 + 1/3) : 2/3 = (4/9 + 3/9) : 2/3 = 7*3/9*2 = 7/6 = 1 1/6
в) (1/3 + 1/4) : (2 - 5/6) = (4+3)/12 : (12-5)/6 = 7/12 : 7/6 = 1/2
г) (1/2 + 1/4 - 2/5) : 4/5 = ((2+1)/4 - 2/5) : 4/5 = (3*5/4*5 - 2*4/5*4):4/5 = (15 - 8)/20 : 4/5 = 7/4*4 = 7/16
д) (1 1/2 - 3/8) : 7 = (3*4/2*4 - 3/8) :7 = (12-3)/8 :7 = 9/8 : 7/1 = 9/8*7 = 9/56
е) (1 - 1/4 + 3/8) : 3/4 = ((4-1)/4 + 3/8) : 3/4 = (3*2 + 3)/4*2 : 3/4 = 3/2= 1 1/2