Bài 2: Giải pt, bpt sau:

6) \(\dfrac{2^{1-x} -2^x + 1}{2^x -1} ≤ 0\)

Bài 2: Giải pt, bpt sau:

4) \(8^x \leq 4.(4-2^x)\)

5) \(\left(\dfrac{1}{3}\right)^{\frac{2}{x}} + 3.\left(\dfrac{1}{3}\right)^{\frac{1}{x}+1} > 12\)

Bài 2: Giải pt, bpt sau:

1) \(3^{x+2} + 9^{x+1} = 4\)

2) \(2^{2x+6} + 2^{x+7} - 17 > 0\)

3) \(9^x - 2. 3 ^{x+1} + 5 < 0\)

4) \(8^x \leq 4.(4-2^x)\)

2. scheme, school, schedule, scholar

24. As soon as Clemens _________ that news, his heart started to pound wildly.

A. was hearing     B. were hearing      C. has heard        D. had heard