mk nghĩ là ko

Have

xong r

D = 2¹⁰⁰ - 2⁹⁹ +2⁹⁸ - 2⁹⁷ +....+ 2² - 2¹ 

2D=2¹⁰¹- 2¹⁰⁰+ 2⁹⁹-2⁹⁸+...............+2³-2²

2D+D =(2¹⁰¹- 2¹⁰⁰+ 2⁹⁹-2⁹⁸+...............+2³-2²) + ( 2¹⁰⁰ - 2⁹⁹ +2⁹⁸ - 2⁹⁷ +....+ 2² - 2¹ ) 

3D= 2¹⁰¹-2¹

D= ( 2¹⁰¹-2¹) : 3

Vậy D= ( 2¹⁰¹-2¹) : 3

Ta có : 4³ = 64

\(\Rightarrow\)x + 1 = 4

x = 3

Vậy x = 3

a = 5 ;  b =0

a =0 ;   b = 5

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5. What do your classmates like doing in the park ?

6. Who did go to work two hours ago ?

7. How many hotels are there in this city ?

8. When did you last see him ?

9. How do you sometimes go to school ?

10. Where does Mr.Smith come from ?

1. There is a small yard in front of Lam's house

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5. What is there in front of your house ?

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