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19 tháng 10 2023

tính nhanh nhé ạ

 

19 tháng 10 2023

Để tính tổng các số từ 11 đến 19, ta có thể sử dụng công thức tổng của dãy số hình học: S_n = a_1 * (1 - q^n) / (1 - q) Trong đó: - S_n là tổng n phần tử của dãy số; - a_1 là phần tử đầu tiên của dãy số; - q là hệ số nhân của dãy số. Áp dụng công thức trên với dãy số từ 11 đến 19, ta có: - a_1 = 11 - q = 2 - n = 5 (vì có tổng cộng 5 số trong dãy) S_5 = 11 * (1 - 2^5) / (1 - 2) S_5 = 11 * (-31) / (-1) S_5 = 341 Vậy tổng các số từ 11 đến 19 là 341. Giải thích: trong dãy số trên, mỗi số tiếp theo là số liền trước cộng thêm 2 (vì q = 2). Chúng ta cứ cộng từng số lại cho đến khi đến số cuối cùng là được tổng của các số trong dãy.

1.   Rewrite the following sentences without changing the meaning, using the word given Giups em vs ak cảm ơn ạ11.My sister goes to school on foot.  My sister                                                                                                                                            _12.The bank is not far from the post office. The bank is                                                                                                                                       ...
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1.   Rewrite the following sentences without changing the meaning, using the word given

 Giups em vs ak cảm ơn ạ

11.

My sister goes to school on foot

.

 

 

My sister                                                                                                                                            _

12.

The bank is not far from the post office.

 

The bank is                                                                                                                                        _

13.

There are many flowers in our garden.

 

Our garden                                                                                                                                            

14.

Ba lives in town.

 

Ba doesn't                    _                                                                                                                     

 

15.

Nam lives in the city.

 

Nam doesn't

3
20 tháng 1 2022

11.

My sister goes to school on foot

.

 

 

My sister walks to school.                                                                                                                                            _

12.

The bank is not far from the post office.

 

The bank is near the post office.                                                                                                                                        _

13.

There are many flowers in our garden.

 

Our garden has many flowers.                                                                                                                                            

14.

Ba lives in town.

 

Ba doesn't live in the countryside.                   _                                                                                                                     

 

15.

Nam lives in the city.

 

Nam doesn't live in the countryside.

11. My sister walks to school.
12. The bank is near the post office.
13. Our garden has many flowers.
14. Ba doesn't live outside the city.
15. Nma doesn't live in the countryside.

7 tháng 4 2021
\frac{\frac{x}{-1}}{6}={\color{#c92786}{\frac{13}{-19}}}+\frac{8}{15}Đáp Án :𝑥=8695
18 tháng 9 2018

6A=5.7.6+7.9.6+9.11.6+11.13.6+13.15.6+...+99.101.6

6A=5.7.(9-3)+7.9.(11-5)+9.11.(13-7)+11.13.(15-9)+13.15.(17-11)+...+99.101.(103-97)

6A=-3.5.7+5.7.9-5.7.9+7.9.11-7.9.11+9.11.13-9.11.13+11.13.15-11.13.15+13.15.17-...-97.99.101+99.101.103

6A=99.101.103-3.5.7 => A=(99.101.103-3.5.7)/6

 Viết lại câu ạ11. She’d like to stay with me this weekend.aShe want _______________________________________________.12. She told me that she’d buy a book for me when she got back.aShe promised _______________________________________________.13.Hue has no intention of telling Dung about this .aHue doesn’t _______________________________________________.14. Some of students would like to study English harder but they can’t.aSome of students...
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yeu Viết lại câu ạ

11. She’d like to stay with me this weekend.

aShe want _______________________________________________.

12. She told me that she’d buy a book for me when she got back.

aShe promised _______________________________________________.

13.Hue has no intention of telling Dung about this .

aHue doesn’t _______________________________________________.

14. Some of students would like to study English harder but they can’t.

aSome of students _______________________________________________.

15. They are going to SaPa next month.

aThey _______________________________________________.

16. Hai doesn’t like being kept waiting too long.

aHai resents _______________________________________________.

17. Cuong said he couldn’t go to the park with Vy.

aCuong _______________________________________________.

18. Mike had an interest in learning North American history in his school days.

aMike was _______________________________________________.

19. Do you think you could give me a hand to move the sofa?

aWould you mind _______________________________________________?

20. I think Jelly really likes Simon

a Jelly _______________________________________________.

1
2 tháng 6 2021

11. She’d like to stay with me this weekend.

aShe want to stay with me this weekend.

12. She told me that she’d buy a book for me when she got back.

aShe promised to buy a book for me when she got back.

13.Hue has no intention of telling Dung about this .

aHue doesn’t intend to tell Dung about this.

14. Some of students would like to study English harder but they can’t.

aSome of students wish they could study English harder

15. They are going to SaPa next month.

aThey have an intention of going to Sapa next month.

16. Hai doesn’t like being kept waiting too long.

aHai resents being kept waiting too long.

17. Cuong said he couldn’t go to the park with Vy.

aCuong said: "I can't go to the park with Vy".

18. Mike had an interest in learning North American history in his school days.

aMike was interested in learning North American history in his school days.

19. Do you think you could give me a hand to move the sofa?

aWould you mind giving me a hand to move the sofa?

20. I think Jelly really likes Simon

a Jelly is thought to like Simon .

10 tháng 4 2019

Đè thừa một số \(\frac{25}{156}\),mk ko lại đề bài nhé

\(A=1-\frac{2+3}{2\cdot3}+.....+\frac{11+12}{11\cdot12}-\frac{12+13}{12\cdot13}\)

\(=1-\frac{1}{2}-\frac{1}{3}+\frac{1}{3}+\frac{1}{4}-...+\frac{1}{11}+\frac{1}{12}-\frac{1}{12}-\frac{1}{13}\)

\(=\frac{1}{2}-\frac{1}{13}=\frac{11}{26}\)

Thanks "Blue Moon" nhìu nha

\(N=\dfrac{2^{19}\cdot3^9-3\cdot3^8\cdot5\cdot2^{18}}{3^9\cdot2^9\cdot2^{10}-2^{20}\cdot3^{10}}\)

\(=\dfrac{2^{18}\cdot3^9\cdot\left(2-5\right)}{3^9\cdot2^{19}\left(1-2\cdot3\right)}=\dfrac{1}{2}\cdot\dfrac{-3}{-5}=\dfrac{3}{10}\)

\(P=\dfrac{8\cdot10+8\cdot24+8\cdot560}{6\cdot45+6\cdot108+6\cdot120\cdot21}=\dfrac{8\left(10+24+560\right)}{6\left(45+108+120\cdot21\right)}=\dfrac{4}{3}\cdot\dfrac{2}{9}=\dfrac{8}{27}\)

14 tháng 7 2016

\(\frac{1}{9}.\frac{2}{145}-\frac{13}{3}:\frac{1}{145}+\frac{2}{145}=\frac{2}{145}\left(\frac{1}{9}+1\right)-\frac{13}{3}:\frac{1}{145}=\frac{2}{145}.\frac{10}{9}-\frac{1885}{3}=\frac{4}{216}-\frac{1885}{3}\)

\(=-\frac{33929}{54}\)

22 tháng 8 2017

\(10+11+12+13+14+15+16+17+18+19=145\)

22 tháng 8 2017

bằng 135 nhé

K mk nha