Question

Rezolvati ecuatiile următoare,undex ∈ Q:a) 16 supra 27:x = 2 supra 9
b) 25 supra 21:x = 5 supra 7
c) 28 supra 45:x = 7 supra 9
d) 63 supra 50:x = 9 supra 5.

Answer 1

x∈Q
a. 16/27 :x=2/9 |·9/2
8/3:x=1
x=8/3
S={8/3}
b. 25/21 :x=5/7 |·7/5
5/3 :x=1
x=5/3
S={5/3}
c.28/45 :x=7/9 |·9/7
4/5 :x=1
x=4/5
S={4/5}
d. 63/50 :x=9/5 |·5/9
7/10 :x=1
x=7/10
S={7/10}