a) Cho S = 3 + 3^2 + 3^3 + .... + 3^1998 CMR: S chia hết cho 39 b) Cho P =3 + 3^2 + 3^3 + .... + 3^1000 CMR: P chia hết cho 120

Cho hình vẽ bên, biết AMC = 25 độ. Ta có sđ AC - sđ BD bằng :

EXERCISE 4: *Complete the sentences with correct forms of the verbs in bracket 1. Nga (brush)___________ her teeth after dinners. 2. We (have)____________ Geography every Wednesday? 3. Nga and Lan (go)___________ to school six days a week. 4. Who (to be)____________ phoning you at the moment? 5. You (hear) ___________the wind? It (blow)____________ very strongly tonight. 6. What your son usually (have)______________for breakfast? 7. Nga (have)___________an English test in two days. 8. Yen (stand)_________ at the corner. She (wait) --------------- for the bus. 9. Summer vacation (come) ____________ soon. What (be) _____________your plan?

The man which she is speaking to is my teacher tìm lỗi sai và chữa

câu a ko cần giải nha mn gíúp mình mấy câu dưới vs vote ai trả lời nhanh nhất á

Tìm `f(x) `biết `f(x – 1) = x^2 + 3x – 2.`

21. She and I (like).............. (watching)..................... TV very much. 22. Where she (go)............? – she (go)................ to the theatre. 23. Mai (go) ..........to school in the morning. She (not go).....to school in the afternoon. 24. What ...she (do) .........on the weekend? She (go).................camping with her friends 25. They (play) ...........volleyball in the school yard now. 26. How often .......he (go) .......swimming? twice a week.

viết tranh này bằng tiếng anh bằng quá khứ đơn

. Despite her young age, she performs excellently. (Rewrite the sentence, using the word given “ALTHOUGH”) __________________________________________________________________ 3. I thought the ending of the film is quite shocking. (Rewrite the sentence, using the word given “AT”) __________________________________________________________________ 4. Children/ must/ learn/ road safety/ before/ allowed/ ride/ bike/ road/./ (Write the sentence, using the cues given) __________________________________________________________________

11. My sister always (wear) nice clothes for work. Today she (wear)........... a blue jacket and shirt. 12. Why you (buy).............. so much food? - Because we (have)..............a party tonight. 13. That film (come)............... to the local cinema next week. You (want)............ to see it? 14. It (not rain)..........right now. The sun (shine)................ and the sky is blue. 15. Alice (not take).................the bus to school every day. She usually (walk).......... instead. 16. She (go).............. to school everyday. 17. Bad students never (work)........................ hard. 18. It often (rain)............... in summer. It (rain)...................... now. 19. He (not have)...................... any car. 20. What you often (do)............... in the morning?