Câu hỏi 2
Khai triển $\left(3 x - \frac{1}{2}\right)^{3}$.
- $27 x^{3} - \frac{1}{8}$
- $27 x^{3} - \left(\frac{27}{2}\right) x^{2} - \left(\frac{9}{4}\right) x + \frac{1}{8}$
- $27 x^{3} - \left(\frac{27}{2}\right) x^{2} + \left(\frac{9}{4}\right) x - \frac{1}{8}$
- $27 x^{3} - \left(\frac{9}{2}\right) x^{2} + \left(\frac{9}{2}\right) x - \frac{1}{8}$
- $9 x^{3} - \left(\frac{9}{x}\right) x^{2} + \left(\frac{9}{4}\right) x - \frac{1}{8}$