Có đáp án rồi thây

\(A=3^{-2}.\left[\left(\dfrac{2}{3}\right)^7+\left(\dfrac{2}{3}\right)^7+...+\left(\dfrac{2}{3}\right)^7\right]\) (có 7 số hạng \(\left(\dfrac{2}{3}\right)^7\))

\(=\dfrac{1}{3^2}.7.\dfrac{2^7}{3^7}\)

\(=\dfrac{7.2^7}{3^9}\)

\(=\dfrac{\dfrac{7}{4}.2^9}{3^9}\)

\(=\left(\sqrt[9]{\dfrac{7}{4}}\right)^9.\left(\dfrac{2}{3}\right)^9\)

\(=\left(\sqrt[9]{\dfrac{7}{4}}.\dfrac{2}{3}\right)^9\)

Mình làm ko chắc chắn lắm

Tham khảo nhs!!

Câu hỏi của Đứa Con Của Băng - Toán lớp 7 | Học trực tuyến

Chúc bn học tốt!!

Past 1:

Directions :complete each sentence with "there" and the verb "be" in the past tense (was or were).Some sentences are negetives (10 points)mình ví dụ câu 1 nha

1) There was a car accident just ten minutes ago.

2) There were several people hurt.

3) There were a lot of police at the scene.

4) There wasn't any news of it on TV . (negative)

5 ) There I was ,watching helplessly.

6) There wasn't anything anyone could do. (negative)

7) There was a big party last night.

8 ) A lot of people were there

9) There was a lot of noise.

10 ) My friend,Bob, was there

??? đã làm đâu

Past 1:

Directions :complete each sentence with "there" and the verb "be" in the past tense (was or were).Some sentences are negetives (10 points)mình ví dụ câu 1 nha

1) There was a car accident just ten minutes ago.

2) There were several people hurt.

3) There was a lot of police at the scene.

4) There wasn't any news of it on TV . (negative)

5 ) There I was ,watching helplessly.

6) There wasn't anything anyone could do. (negative)

7) There was a big party last night.

8 ) A lot of people were there

9) There was a lot of noise.

10 ) My friend,Bob, was there

WHAT??!!?