va rog!! doar exercitiile 5,7,8

ex 5
4/4=2/2
2/8>1/8
1/5=2/10
5/6<8/6
6/6=3/3
6/5>4/5
1/3=3/1
8/10>6/10
2/7>6/7
3/6>3/8
ex 7
7/8
ex 8
punctul "a)"