\(2^2\cdot2^3\)

\(=2^{2+3}\)

\(=2^5\) hoặc \(=32\)

32 nhaa tim cho mik

a⁶

Chọn D em nhá

Nỗi toa có thể chở được số khách là: 

     4 x 7 = 28 (khách)

  vì: 772 : 28 = 27(dư 16)

Cần số toa là 27 + 1  = 28(toa)

   Đáp số: 28 toa 

A = 12² + 14² +....+ 2010²

A = 2².(6² + 7² +....+ 1005²)

Đặt B = 6² + 7² +....+ 1005²

       B = (1+ 5).6 + (1 + 6).7 + ...+(1 + 1004).1005

       B = 6 + 5.6 + 7 + 6.7 +...+ 1005 + 1004.1005

       B = 5.6 + 6.7 +...+ 1004.1005 + (6 + 7 + 8 +...+1005)

Đặt C = 5.6 + 6.7 +...+ 1004.1005

       D = 6 + 7 + 8 + ...+ 1005

5.6.3 = 5.6.(7- 4) = 5.6.7 - 4.5.6

6.7.3 = 6.7.(8 - 5) = 6.7.8 - 5.6.7

....................................................

1004.1005.3 = 1004.1005.(1006 - 1003) = 1004.1005.1006 - 1003.1004.1005

Cộng vế với vế ta có:

3.C = - 4.5.6 + 1004.1005.1006

    C = 338358000

D = 6 + 7 + 8 +...+ 1005 

D = (6 + 1005).{(1005 - 6)+ 1}: 2 

D = 505500

B = 338358000 + 505500

B = 338863500

A = 2².B 

A = 4.338863500

A = 1355454000

1. What . . . . . . . names ? – They’re Mai and Nga.

A. are / their

B. is / your

C. are / they

D. Both (A) and (C)

2. Which word has the final sound /s / ?

A. armchairs

B. names

C. thanks

D. erasers

3. There are. . . . . . . . . ……….. students in my school this school year.

A. nine hundred and ninety-nine

B. nine hundreds and ninety-nine

C. nine hundred ninety-nine

D. nine hundred and ninety-nines

4. How . . . . . … you ? I am twelve years old .

A. are

B. old are

C. is

D. old is

5. What ………..they………….. ? – They’re doctors .

A. do / do

B. does / do

C. do / does

D. does / does

6. What is this ? This is . . . . . . . . . eraser.

A. a

B. the

C. an

D. Ø

7. I am ………………… brother.

A. my

B. her

C. he

D. you

8. Where………… he ………. ?

A. do / live

B. does / lives

C. do / lives

D. does / live

9. We live ………………Le Loi street………QuyNhonCity

A. on / in

B. at / in

C. in / at

D. to /in

10. How many……… ………. there in your school?

A. student - is

B. students - are

C. students - is

D. are - students

thì sao cậu có việc gì

Đáp án: Khoai lang, sắn, gạo.

Khoai, săn, gạo

Are you hungry? Do you want some thing to eat?

Jill is interested in politicts but she doesn't belong to a political party.

Don't put the dictionary away. I use it.

Don't put the dictionary away. I need it.

Who is that man? What does he want?

The boys often play games on the yard.

The moon moves around the earth.

Every day I get up late, so I don't feel tired.

(x-2)^8 = (x-2)^3

=> (x-2)^8 - (x-2)^3 = 0

=> (x-2)^3.[(x-2)^5 - 1] = 0

=> (x-2)^3 = 0 hoặc (x-2)^5 = 1

=> x - 2 = 0 hoặc x - 2 = 1

=> x = 2 hoặc x = 3

\(\left(x-2\right)^8=\left(x-2\right)^3\)

\(\Leftrightarrow\left(x-2\right)^8-\left(x-2\right)^3=0\)

\(\Leftrightarrow\left(x-2\right)^3\left[\left(x-2\right)^5-1\right]=0\)

\(\Rightarrow\left(x-2\right)^3=0\) hoặc \(\left(x-2\right)^5-1=0\)

     \(x-2=0\)              \(\left(x-2\right)^5=1\)

     \(x=2\)                     \(x-2=1\)

                                    \(x=3\)

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