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22 tháng 11 2021

bằng 1244 nha bạn

22 tháng 11 2021

TL: 1244 nha 

DD
22 tháng 11 2021

\({\left( {2x - \frac{1}{{\sqrt x }}} \right)^{16}} = \sum\limits_0^{16} {C_{16}^k{{\left( {2x} \right)}^k}{{\left( {\frac{{ - 1}}{{\sqrt x }}} \right)}^{16 - k}}} = \sum\limits_0^{16} {C_{16}^k{{.2}^k}.{{\left( { - 1} \right)}^{16 - k}}.{x^k}.{{\left( {{x^{\frac{{ - 1}}{2}}}} \right)}^{16 - k}}} = \sum\limits_0^{16} {C_{16}^k{2^k}.{{\left( { - 1} \right)}^{16 - k}}.{x^{\frac{3}{2}k - 8}}} \)

Số hạng không chứa \(x\) khi: \(\frac{3}{2}k - 8 = 0 \Leftrightarrow k = \frac{{16}}{3}\)

Do đó số hạng không chứa \(x \) trong khai triển đã cho là \(0\).

20 tháng 4 2023

đáp án là nằm trong khoảng (13,18)

 

1. Good friendship should be based on ..............................understanding.          a. unselfish      b. suspicious   c. quality         d. mutual2. She is talkative. She can’t ................................a secret.          a. keep             b. make            c. do                d. break3.  ................................is  a person we only know but don’t have a deep relationship.          a. an acquaintance                   b. a relative      c. a sister         d. all...
Đọc tiếp

1. Good friendship should be based on ..............................understanding.

          a. unselfish      b. suspicious   c. quality         d. mutual

2. She is talkative. She can’t ................................a secret.

          a. keep             b. make            c. do                d. break

3.  ................................is  a person we only know but don’t have a deep relationship.

          a. an acquaintance                   b. a relative      c. a sister         d. all are correct

4. Friends must be loyal .......................each other.

          a. to                 b. too               c. two              d. on

5. A ............................person don’t want to give, but only want to take.

          a. unselfish      b. generous      c. selfish          d. selfless

6. They /an interest /with /take up /enthusiasm, but they /it /are /soon /tired of

          a. They take an interest up with enthusiasm, but they are soon tired it of

          b. They take up an interest with enthusiasm, but they are soon tired of it

          c. They take up an interest with enthusiasm, but soon they are tired of it

          d. b&c are corect

7. My friend is .......................... He never tells lies.

          a. modest         b. honest          c. caring           d. helpful

8. My best friend, Hà, has a sense of ............................. He always makes us laugh.

          a. helpful         b. pleasant       c. humour        d. study

9. letters / I / write / some / have

          a. I have some letters writing   b. I have some letters to write

          c. I have write some letters      d. all are correct.

10.  I was delighted ............................the news.

          a. to hear         b. hearing        c. to hearing     d. hear

1
18 tháng 11 2021

em mỗi có lớp 6 thôi em xin nhé em chỉ chúc chị làm dc bài này càng muộn càng tốt