Cho góc \(\alpha\) với 90\(^0\) <\(\alpha< 180^0\) . Khẳng định nào sau đây là đúng 

Ở ruồi giấm 2n = 8 . Một tế bào đang ở kì giữa của nguyên phân . Hãy tính số NST đơn ,số NST kép , tâm động , cromatit có trong tế bào trên .

Giúp mk vs !!

Khái quát những việc làm của Liên xô đã giúp đỡ Việt nam trong cuộc kháng chiến chống Mĩ cứu nước

1. Thu / wish / have / new bike.

2. They / be / in Ha noi / twice.

3 . We/ used / go / picnic / weekends / last year.

4. The chilren / not see / that show / T.V / last week.

5. Hoa / visit / her aunt and uncle / this summer.

6. Phong’s father / catch / a train / Hai Phong / last night.

7. The teacher / have / a meeting / tomorrow.

8. Lan’s brother / win / the race/ last month.

9. They / not see / one another / long time.

10. I / wish / it / not rain / today.

11. Internet/ fast/ convenient/ way/ information/ which/ very update.

12. I / enjoy/ sutf/ net/ but/ not /have/ much time/ it.

13. How many hours/ you/ spend/ watch TV/ every day.

14. your father / like/ watch/ football matches/ TV?

15. wear/ uniform/ encourage / students / proud / school.

16. We /not use/ wear / jeans/ when/ study/ primary school.

17. Sister/ wear / new Ao dai / only twice/ since / she / buy / it.

18. Liz / wish / she / be going / Ha Noi / parents / next Sunday.

19. He / work / that company/ for / 20 years .

20. It / difficult / get / there / on time /

21. How far / office / from / here/ ? /

23. You / better / not / talk / him /

24. I / read / a book / when / friends / come /

25. If we / not / study hard / not pass / exam /

26. Alex/ phone / me / six times/ this week.

27. Roger/ want / buy / book / so / he / just / go / town.

28. We / can not / sleep / last night / because / noise / next door.

29. He / used / have / breakfast / home / when/ he / be / small.

30. She / ask / Mom / give/ some / more / money.

31. Please / tell/ if / you/ take/ books / my room.

32. I / not seen / Jane / since / we / leave / high school.

33. If / it / not rain / tomorrow,/ we / go / a picnic.

34. We/ not meet / each other / a long time.

35. If / you / be / a billionaire /, what / you / do?

Giúp MK với !!

\(\left(a+b+c\right)\left(\frac{1}{a}+\frac{1}{b}+\frac{1}{c}\right)\)\(=1+\frac{a}{b}+\frac{b}{c}+\frac{b}{a}+1+\frac{b}{c}+\frac{c}{a}+\frac{c}{b}+1\)

\(=\left(1+1+1\right)+\left(\frac{a}{b}+\frac{b}{a}\right)+\left(\frac{a}{c}+\frac{c}{a}\right)+\left(\frac{b}{c}+\frac{c}{b}\right)\)

\(=3+\frac{a^2+b^2}{ab}+\frac{a^2+c^2}{ac}+\frac{b^2+c^2}{bc}\)= \(3+\frac{a^2+b^2}{\frac{a^2+b^2}{2}}+\frac{a^2+c^2}{\frac{a^2+c^2}{2}}+\frac{b^2+c^2}{\frac{b^2+c^2}{2}}\)= 3 + 2 + 2 + 2 = 9

Số số hạng của dãy là :

 ( 50 - 1 ) : 1 + 1 = 50 ( số hạng )

Tổng của dãy số trên là :

  ( 50 + 1 ) x 50 : 2 = 1275 

    Đáp số : 1275

Bài 2 :

U = \(\frac{4x}{x^2+x\sqrt{x}+\sqrt{x}+1}:\left(\frac{1}{x+2\sqrt{x}+1}-\frac{2}{1-x}+\frac{1}{x-2\sqrt{x}+1}\right)\)

a, Tìm đkxđ

b, Rút gọn

Bài 1 :

T =\(\left(\frac{\sqrt{x}+2}{3\sqrt{x}}+\frac{2}{\sqrt{x}+1}-3\right):\frac{2-4\sqrt{x}}{\sqrt{x}+1}+\frac{x-3\sqrt{x}-1}{3\sqrt{x}}\)

a, Tìm ĐKXĐ

b, Rút gọn

c, Tìm x để T < 0

Help me !!!