Có 2 bạn là : Hùng và Nam

học tốt

ko chắc lắm.

Co 2 bn choi ban bi

1. I (not see)……………………haven't seen……………………………………………… him sincelast Christmas.

2. We (go)……………………have gone………….. to Vung Tau several times.

3. He .....has... already (write)……………written…………………………………………………………. to his parents.

4. Liên (not prepare)…………………………hasn't prepared………………… her lessons yet.

5. They .  have....... just (receive)……………received………………………………..a package from their grandfather.

6. Miss Huong (teach)……………has taught………………………………………….us English for 2 years.

7………Has……………………….she (feed)……………………fed…………………………………her dog yet?

8. We  .have....... never (take)………………………………taken…………………………… a bus to school before.

9. Next week, my uncle (come)………………will come………………………..back home for Christmas.

10. My teacher is explaining the lesson but I (not understand)……don't understand…………………..what he is saying.

11. Lan (be)………………was………………….my next door neighbor when I livedin Hai Phong.

đúng thì cho mk nha

Bài tập chia động từ

1. I (not see)…………………haven't seen…………………… him sincelast Christmas.

2. We (go)…………have gone…….. to Vung Tau several times.

3. He has already (write)…………written…………………………. to his parents.

4. Lien (not prepare)……hasn't prepared…………… her lessons yet.

5. They have just (receive)………received…………..a package from their grandfather.

6. Miss Huong (teach)………has taught…………………….us English for 2 years.

7……………Has……….she (feed)…………fed……………………her dog yet?

8. We have never (take)………taken…………… a bus to school before.

9. Next week, my uncle (come)………will come……………..back home for Christmas.

10. My teacher is explaining the lesson but I (not understand)…………don't understand…..what he is saying.

11. Lan (be)…………was……………….my next door neighbor when I livedin Hai Phong.

B = 1 + 5 + 5² + 5³ + ... + 5¹⁰

B = 5⁰ + 5¹ + 5² + 5³ + ... + 5¹⁰

5B = 5¹ + 5² + 5³ + 5⁴ + ... + 5¹¹

4B = 5B - B = 5¹¹ - 1

B = \(\frac{5^{11}-1}{4}\)

Bạn tự tính nha mình không dùng máy tính :v

Vì \(\hept{\begin{cases}2.3.5.11⋮3\\13.17.19.21⋮3\end{cases}\Rightarrow2.3.5.11+13.17.19.21⋮3}\)

Mà \(2.3.5.11+13.17.19.21>3\)

=> A là hợp số

Gọi số cần tìm là xy

 Theo bài tao có

xy *11 =x9y

=) x + y =9 

Còn lại tự làm nhé cưng !

1 đáp số 18.11=198 => xy=18

2Đáp số: 10.101=1010 => x=1; y=0

\(15^{12}>81^3\times125^5\)

\(345^2>342\times348\)

(3x-2)^2=256

3x-2=16

3x=16+2

3x=18

x=6

\(\left(3x-2\right)^2=256\)

\(\left(3x-2\right)^2=16^2\)

\(\Rightarrow3x-2=16\)

\(3x=16+2\)

\(3x=18\)

\(x=18:3\)

\(x=6\)

Vậy .....

Chúc bạn học tốt !

Gọi số cần tìm là \(\overline{ab8}\) theo bài ra ta có

\(\overline{8ab}=2.\overline{ab8}+100\Rightarrow800+\overline{ab}=20.\overline{ab}+16+100\)

\(\Rightarrow19.\overline{ab}=684\Rightarrow\overline{ab}=684:19=36\)

Vậy số cần tìm là 368

để chiều ik bn bây h mk ik hc òi 

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nhưng bạn phải k cho mk 

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