2x - 1 = 2

2x = 3

x = 3/2

10000

Lỗi

\(2^{n+3}+2^n=144 \\2^n.2^3+2^n=144 \\2^n.9=144 \\2^n=16 \\n=4\)

Tham khảo

D

\(A=\dfrac{x+\sqrt{x^2-1}}{x^2-(x^2-1)}+\dfrac{x-\sqrt{x^2-1}}{x^2-(x^2-1)} \\=\dfrac{2x}{1}=2x\)

Chọn C

\(B=\dfrac{\sqrt {ab}(\sqrt a - \sqrt b)}{\sqrt a-\sqrt b}-\sqrt{ab} =\sqrt{ab}-\sqrt{ab}=0\)

B

9. has sat??