Răspuns :
[tex](3x)^5=9^5\times 3^2\times 3^3\Leftrightarrow (3x^5)=3^{10}\times 3^2\times 3^3\Leftrightarrow (3x)^5=3^{15}\\ \\
3x=3^3\Leftrightarrow x=3^2\Rightarrow x=9\\ \\
S=\{9\}[/tex]
(3x)^5=9^5×3^2×3^3
(3x)^5 = (3^2)^5 x 3^2 x 3^3
(3x)^5 = 3^10 x 3^2 x 3^3
(3x)^5 = 3^ (10+2+3)
(3x)^5 = 3^15 = (3^3)^5
3x = 3^3 = 27
x = 27 : 3
x = 9
(3x)^5 = (3^2)^5 x 3^2 x 3^3
(3x)^5 = 3^10 x 3^2 x 3^3
(3x)^5 = 3^ (10+2+3)
(3x)^5 = 3^15 = (3^3)^5
3x = 3^3 = 27
x = 27 : 3
x = 9