Răspuns :
7).3/5, 5/9; 3/9- subunitare
3/3; 5/5;9/9;- echiunitare
5/3; 9/3; 9/5;- supraunitare
8). 2/6-1/3; 2/4-4/8; 3/2-9/6; 7/7-9/9;
3/3; 5/5;9/9;- echiunitare
5/3; 9/3; 9/5;- supraunitare
8). 2/6-1/3; 2/4-4/8; 3/2-9/6; 7/7-9/9;