----- Nội dung dịch tự động từ ảnh -----
```
4) \(\left( \frac{5}{6} \right)^{2x-1} = \left( \frac{5}{6} \right)^{5}\)

5) \(\left( \frac{3}{4} \right)^{2x-1} = \left( \frac{3}{4} \right)^{4}\)

6) \(16 = \frac{2^{x}}{2}\)

7) \((-3)^{x} = -27\)

8) \(8^{x} \cdot 2^{x} = 4\)

9) \(\left( -\frac{1}{10} \right)^{x} = \frac{1}{100}\)

10) \(\left( -\frac{1}{10} \right)^{x} = 0,01\)

11) \(\left( -\frac{3}{2} \right)^{x} = \frac{9}{4}\)

12) \(\left( -\frac{3}{5} \right)^{x} = \frac{9}{25}\)

13) \(\left( -\frac{2}{3} \right)^{x} = \frac{-8}{27}\)

14) \(\left( -\frac{1}{2} \right)^{x} = -\frac{1}{8}\)

15) \(\left( \frac{2}{5} \right)^{x} = \frac{4}{25}\)

Bài 15. Tìm số nguyên x, nếu biết:
1) \(2^{x} = 4^{3}\)
2) \(2^{x} = 4^{6}\)
3) \(3^{x} = 9^{10}\)
4) \(2^{x} = 8^{3}\)
5) \(2^{x} = 8^{9}\)
6) \(3^{2x+2} = 9^{10}\)
```