zad.

68. a) -4 4/9 - 2 1/6 = -4 8/18 - 2 3/18= -6 11/18 b) 3 1/4 - 8 5/6 = 3 6/24 - 8 20/24= 2 30/24 - 8 20/24= -6 10/24= -6 5/12 c) -2 3/5 + 7 1/3 = -2 9/15 + 7 5/15= -9/15 + 5 5/15 = 4 20/15 - 9/15= 4 11/15 d) =-9,22 e) = 5,16 f) =-3,85 g) -3 1/7 - 1 1/5= -3 5/35 - 1 7/35= -2 40/35 - 1 7/35 = -3 47/35 = -4 12/35 h) 4 5/6 - 8 1/5 = 4 25/30 - 8 6/30 = 4 25/30 - 7 36/30= -3 11/30 69. a)-7,73-1,35=-9,08 b)=3,735-11,125=-7,39 c) -10/9-1/6+9 3/4 +6 1/4=-10/9-1/6+16=-60/54-9/54+16=-69/54+16=-1 15/54 +16=14 39/54 = 14 13/18 d) =-9,3+12,2-(72,8+13,002)=2,9-90,802=-88,902 70. a) = 5+ 13 1/7=18 1/7 b)=-8+3=-5 c)=-5 +3 8/12=-5 +3 2/3=-1 1/3 d) -1/2 -3/4+ 1 1/2-1/4=1-1=0