Răspuns:
³⁾9/14-²⁾5/21=²¹a/2-²⁾b/21
(27-10)/42=(21a-2b)/42
21a-2b=17
a=1
21-2b=17=>2b=21-17=>b=4:2=>b=2
a=3
21·3-2b=17=>2b=63-17=>b=46:2=>b=23
a=5
21·5-2b=17=>b=44
(a,b)=(1,2);(3,23);(5,44)
____________________
⁵⁾11/24-⁶⁾a/20=¹⁵⁾b/8-⁸⁾4/15
(55-6a)/120=(15b-32)/120
55+32=15b+6a
6a+15b=87
a=2
12+15b=87=>15b=87-12=>b=75:15=>b=5
a=7
42+15b=87=>15b=87-42=>b=45:15=>b=3
(a,b)=(2,5);(7,3)
