Cho D =

Câu hỏi: Cho D = $\frac{{\text{5x}}^{\text{2}}}{\text{5x}-\text{6}}+\frac{{\text{x}}^{\text{2}}-\text{1}}{\text{6}-\text{5x}}-\frac{\text{7}+\text{x}-{\text{x}}^{\text{2}}}{\text{5x}-\text{6}}$ . Sau khi thu gọn hoàn toàn thì D có tử thức là?

A. x

B. x + 1

C. $\frac{\text{x}}{\text{x}-\text{1}}$

D. $\frac{\text{x}}{\text{x+1}}$