Odpowiedź :
10,6: (2 1/4+2, 75)= 106/10 : (9/4 +11/9)= 106/10: 20/9= 106/10*4/20= 2,12
1 7/9 : 2 2/3- 2/3:1 3/5= 16/9:8/3- 2/3:8/5= 16/9*3/8- 2/3*5/8= 2/3- 5/12= 8/12- 5/12= 3/12
1 7/9 : 2 2/3- 2/3:1 3/5= 16/9:8/3- 2/3:8/5= 16/9*3/8- 2/3*5/8= 2/3- 5/12= 8/12- 5/12= 3/12