15 si 14 va rog din tot sufletul meu si va rog explicație!!
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14
(2/5)^2x * (2/5)^3 = (2/5)^7
(2/5)^(2x + 3) = (2/5)^7
2x + 3 = 7
2x = 4
x = 2
_______________
(9/8)^2x : (9/8)^4 = (9/8)^16 * (9/8)^2
(9/8)^(2x - 4) = (9/8)^18
2x - 4 = 18
2x = 22
x = 11
________________
4/10 = 2/5
6/15 = 2/5
(2/5)^16 = (2/5)^(x + 13)
x + 13 = 16
x = 3
________________
2/10 = 1/5
5^7 * (1/5)^7 = 1
13^x / 11^x * 11^x / (3*13)^x = 1/3^x
1 = 1/3^x
3^x = 1
x = 0
_____________________
2/18 = 1/9
(1/9)^(5 + x) = (1/9)^10
5 + x = 10
x = 5
__________________
4/10 = 2/5
(2/5)^x : (2/5)^6 = (2/5)^6
(2/5)^(x - 6) = (2/5)^6
x - 6 = 6
x = 12
__________________
15
4/10 = 2/5
(2/5)^2x * (2/5)^3 = (2.5)^7
(2/5)^(2x + 3) = (2.5)^7
2x + 3 = 7
2x = 4
x = 2
____________
25/10 = 5/2
(5/2)^3x * (5/2)^4 = (5/2)^10
(5/2)^(3x + 4) = (5/2)^10
3x + 4 = 10
3x = 6
x = 2