giúp mình làm câu 4 phần 1 và câu 1 phần 2 với ạ cảm ơn nhiều

tìm các số nguyên x sao cho:a) (x^2+5).(x^2-25)=0. b) (x^2-5)(x^2-25)<0. c) (x-2).(x+1)=0. d) (x^2+7).(x^2-49)<0. e) (x^2-7).(x^2-49)<0

hãy thay quan hệ từ trong từng câu bằng quan hệ từ khác để có câu đúng a. cây bị đổ (nên) gió thổi mạnh b. trời mưa (và) đường trơn c. bố mẹ thưởng cho em một hộp màu (v)ì em học giỏi d. (tuy) nhà xa (nhưng) bạn tiến thường đi học muộn dấu goặc là để đánh dấu quan hệ từ

viết PTHH minh họa cho các phản ứng sau, xác định dạng phản ứng a,Oxit hóa sắt b CO phản ứng Fe2O3 c cho K2O vào nước d, đốt cháy Axetylen e, Điều chế H2 g Điều chế O2 h điều chết bazo từ kim loại i điều chế axit từ phi kim

Tìm hiểu muối ăn làm từ nước gì?

Giu0 Ps mk vs , phần cuối rồi , mk vote 5sao môn toán nhé,cám ơn

giúp mình tận tình mình sẽ cho câu trả lời hay nhất nhé A. PHONETICS Question I. Find the word which has different sound in the part underlined. 1. A. what B. where C. whole D. why 2. A. out B. round C. about D. would 3. A. listened B. stayed C. wanted D. played 4. A. humor B. history C. hour D. hobby 5. A. worked B. naked C. liked D. looked Question II. Find the word which has different stress pattern from the others. 1.A. person B. father C. teacher D. enjoy 2. A. happen B. enjoy C. destroy D. agree 3.A. advise B. permit C. picture D. expect 4.A. erupt B. visit C. listen D. open 5.A. depend B. advise C. affect D. listen B.LANGUAGE FOCUS. Question I. Circle the best option A, B, C or D to complete each sentence. 1.My students love _________ English very much. A. learn B. learnt C. learning D. to learn 2.My house __________________ yesterday. A. repaired B. is repaired C. was repaired D. were repaired 3. I don’t have a computer at home, _________I can’t get access to the Internet. A. however B. so C. although D. but 4. Don’t forget to ring me up if _________ any changes in the timetable. A. they are B. it will be C. there are D. there will be 5. _________ the weather improves, we’ll go for a walk. A. Unless B. As C. If D. Since 6. Study harder _________ A. if you will pass the exam B. and you pass the exam C. unless you pass the exam D. or you won’t pass the exam 7. If I’m tired in evenings, _________ A. I went to bed early B. I go to bed early C. I’d go to bed early D. I’d have gone to bed early 8. I won’t lend you this money_________ you promise to pay it back. A. if B. unless C. or D. or else 9. If services are increased, taxes_________ A. probably go up B. will probably go up C. probably went up D. going up probably 10. She will be ill _________ A. unless she takes a few days’ rest B. provided she takes a few days’ rest C. in case she takes a few days rest D. if she takes a few days’ rest 11. If I_________ to the store later, I’ll get you some milk. A. will go B. went C. go D. was going 12. Please turn _______ the light when you leave the room. A. on B. off C.up D. down 13.If I _________________free time , I will go swimming. A. have B. has C. is having D. will have 14.My sister started_________ English five years ago. A. learn B. learnt C. learning D. to learn 15.They have seen this film, _________________ A. do they B. don’t they C. haven’t they D. have they Question II. Give the correct form of the following verbs: 1. I (go) _________ to school by bicycle every day. 2. When I(come)_________ home from work, my mother was cooking dinner. 3.They ( play)_________________football at the moment. 4. If you (study )_________harder, you will pass the exam. 5.I wish he (not leave) _________________ here 6.He (live) __________________in Australia for 10 years. 7.Ba enjoys (play)______ football in the morning. 8. My house ( build)_______ in 2004. 9. If the weather gets worse, we (not go) _______ to the beach. 10.I wish I (live) ______ near my school. 11. My brother usually (go) _______ to school by bike every day. 12. Last night, my father ( watch) _____ TV 13.I wish I ( know) ______her address 14. My father enjoys (watch) _______ television in the evenings. 15.I wish I ( be ) ______ taller. 16. When I (come) __________ home from work yesterday, my mother was cooking dinner. 17.My house ________ (build) yesterday. 18. We (not see) ________each other since Monday. 19. If the weather is fine, we (go) ________ for a picnic. 20. She asked me if I ( like ) ________ pop music. 21. Ba hates (watch) ________ the advertisements on TV. 22. Mrs. Nga enjoys (listen) ____ to music in her free time. 23. If Mai doesn’t work hard, she (not fail) ____ the exam. 24. We (not meet) ____ her since we lived here. 25. I (visit) ______ Hue last week 26. I don’ know many English words. I wish I (know) ____more English words. 27. Tuan and Huong (not/go) ___ to the cinema last night. 28. My brother used to ( go ) _____ to work by motorbike. Now he cycles. 29. Last night we (go) ____ to Lan’s birthday party. 30.Men used ( be ) ____ the bread winner of the family.

Giúp em vs các chế ơi!!!!!!!!!!!!!!!

câu 1:trong những câu dưới đây câu nào là câu bộc lộ cảm xúc câu nào là câu cảm thán a,A!sông ngân b,Ai làm cho bể kia đầy Cho ao kia cạn ,cho gầy cò con

Cho góc xOy bằng x và một độ dài bằng l. Hai điểm A,B di động trên hai cạnh tương ứng sao cho độ dài AB luôn bằng l. Gọi i là tâm đường tròn ngoại tiếp tam giác OAB a, CmR : tam giác IAB có các kích thước không đổi b, Tìm quỹ tích điểm í