Question

Subpunctele b și c (cele încercuite)
Dau coroniță va rog mult!!​

Answer 1

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)