(1,75+2 1/3)/(6,5-2/3) = 0,7
1) 1,75 + 2 1/3 = 1 3/4 +2 1/3 = 7/4 +7/3 = 21/12 + 28/12 = 49/12
2) 6,5 - 2/3 = 6 1/2 - 2/3 = 13/2 - 2/3 = 39/6 - 4/6 = 35/6
3) 49/12 : 35/6 = 49/12 * 6/35 = 7/10 = 0,7
(4,1 - 2 3/4)/(1 16/21 + 4 2/3) = 0,21
1) 4,1 - 2 3/4 = 41/10 - 11/4 = 164/40 - 110/40 = 54/40 = 27/20
2) 1 16/21 + 4 2/3 = 37/21 + 14/3 = 37/21 + 98/21 = 135/21 = 45/7
3) 27/20 : 45/7 = 27/20 * 7/45 = 21/100 = 0,21