a, \(2.16\ge2^n>4\)

\(2.2^4\ge2^n>2^2\)

\(2^5\ge2^n>2^2\)

\(5\ge n>2\)

\(\Rightarrow n\in\left\{4;3\right\}\)

b,\(9.27\le3^n< 243\)

\(3^2.3^3\le3^n< 3^5\)

\(3^5\le3^n< 3^5\)

\(5\le n< 5\)

=> Không có giá trị của n

d, (1/7)². 1/7 . 49²

= (1/7)³. (7²)²

= (1/7)³. 7⁴

Đến đây ko bt tính như nào nữa, bạn có thể tự làm tiếp được khum?

A. Traffic lights ahead

are taught

1. doesn't - don't

2. speak - speaks

3. goes - go

4. gets - get

5. teach - teaches

6. doesn't - don't

7. aren't - don't

8. is - are

9. am - is

10. What do ... - What does ...

a, 5 - (-5/11)⁰+ (1/3)³.3

= 5 - 1+ 1/27.3

= 5 - 1 + 1/9

= 4 + 1/9

= 37/9

b, 2³+33.(1/3)⁰+ \([\) (-2)²: 1/2\(]\)

= 8 + 33 . 1+ (4 :1/2)

= 8 + 33 + 8

= 49