3,5 - 11/3 ) : 2/13 = - 1_1/12
1 2
1) 3,5 - 11/3 = 3_1/2 - 3_2/3 = 3_3/6 - 3_4/6 = -1/6
2) -1/6 : 2/13 = -1/6 * 13/2 = - 13/12 = -1_1/12
1) 2,8-2,4=0,4
2) - 4,6+4,11=-0,49
3) - 23,2+1,1=-22,1