cho Parabol (P) : y = x^2 và đường thẳng (d) :y = 4x+ 2m^2-1 ,với m là tham số a) Chứng minh rằng (d) luôn cắt (P) tại 2 điểm phân biệt với mọi m b) Gọi A( x1,y1), B(x2,y2) là tọa độ giao điểm của (d) và (P) . Tìm m để (y1−2m^2+4)(y2−2m^2+4)=−55

Tìm giá trị ng nguyên của x để biểu thức: B=8-x phần x-3 có giá trị nhỏ nhất. Giúp e vs ạ

Cho Δ ABC có ba góc nhọn nội tiếp (O;R). Giả sử các điểm B,C cố định và A di động trên (O) sao cho AB < AC < BC. Đường trung trực của đoạn thẳng AC cắt AB và BC lần lượt tại M và N. Chứng minh: OM.ON = R2. Bốn điểm M,N,P,Q cùng nằm trên một đường tròn. Giả sử hai đường tròn ngoại tiếp Δ BMN và Δ CPQ cắt nhau tại S và T. Chứng minh ba điểm S,T,O thẳng hàng.

Nhận xét tình hình nước ta trong thời kì dựng nước

tìm các số a3b -cùng chia hết cho 3 và 5

Exercise 1: Find the word which has a different sound in the part underlined 1. A. beds B. clocks C. walls D. tables 2. A. mothers B. centres C. aunts D. cousins 3. A. cities B. watches C. dishes D. houses 4. A. grandparents B. brothers C. uncles D. fathers 5. A. books B. walls C. rooms D. pillows 6. A. poster B. sofa C. own D. laptop 7 A. fridge B. light C. picture D. living 8. A. television B. toilet C. bed D. chest 9. A. book B. look C. door D. room 10. A. clocks B. villas C. tables D. chairs Exercise 2: Put the words into THREE groups (/ s /, / z / and / iz /) books, doors, windows, boards, clocks, bags, pencils, desks, schools, classrooms, students, teachers, couches, benches, glasses, brushes, maps, sinks, beds, caculators, villars, lamps - / iz/ : ………………………………………………………………………………………………….. - /s/: ………………………………………………………………………………………………….. - /z/: ………………………………………………………………………………………………….. Exercise 3: Add “ my, your, I, you, he, she, her, they”( more than one answer): 1. ________live on Le loi street 2. Hello, ________name is Minh 3. What’s________ name?. My name’s Nam 4. Where do________live? 5. How old are________? 6. This is Nam. ________ is a student 7. My new classmate is Mai. ________is in class 6A. 8. ________ am 12 years old 9. I have 2 friends. ________are Nam and An 10. How do ________ spell it ? H_O-A Exercise 4: Choose the best answer: 1. Maryan is ………….. home today (at/ on / between/ in) 2. The bank is ……………… the supermarket (on / in / next to/ between) 3. The drug store is between the hospital ………….the toy store (at/ and / between/ in) 4. What is there in the bedroom? (cupboard/ shower / bed/ dishwasher) 5. There is ……………. television in the living room (a/ an / in / on) 6. ………….the left of the house, there is a garden. (In/ To/ Of/ On) 7. ………………..…. markets are there in your hometown? (How often/ How old / How many/ What ) 8. Thet cat is ………….the table (at/ on / between/ in) 9. I ………………TV every day. (watches / watch/ to watch/ watching) 10. Mary ………….. go to school by bike. (going/ go / goes / to go) Exercise 5: Complete the sentences with suitable prepositions of place. 1. The picture is ………… the wall 2. The book store is …………… the toy store and the drug store. 3. Can you see the cat ……………the picture? 4. The child is hiding ………………the tree. 5. The book is……………… the left ……….the lamp. 6. My house is next ……………to the river. 7. Jone lives ……………..America. Exercise 6: Underline the mistakes and then correct it. 1. Where is the flowers? ……………………………………. 2. There are a park near Tuan’s house. ……………………………………. 3. The television is between to the telephone. ……………………………………. 4. The mountains are to the left in the house. ……………………………………. 5. My school have a big yard. ……………………………………. 6. Lan watchs TV everyday. ……………………………………. 7. What time do she get up? ……………………………………. 8. Mr.Quyen teach Engish at Yen Nhan secondary school……………………………………. 9. The students are in the classroom. …………………………………… Exercise 7: Give the correct form of the word given to complete the sentences. 1. I keep my socks in the bottom_______________. (DRAW) 2. I don’t attach any ___________to these rumours. (IMPORTANT) 3. Payment is _________________upon delivery of the goods. (CONDITION) 4. This story is apparently a complete ________________. (INVENT) 5. What a ____________ thing to say! (BEAUTY) 6. There’s no ___________________ in the results. (DIFFERENT) 7. Do you get many_________________? (VISIT) 8. Do you have any ideas? You’re the _______________one. (CREATE) Exercise 8: Give the correct form of the words in the blank (Using the present simple and present continuous). 1. Lan (not have) ______ many friends in her new school. 2. Hung (come) ______ from Ha Noi but he (stay) ______ with his relatives in Ho Chi Minh city at the moment. 3. We (not drive) ______ to work every day. We (go) ______ by bus. 4. Who you (talk) _______ to on the phone now, Minh? 5. Where your new friend (live) _________ Nga? -She (live) ________ on Hang Bai street. 6. you (be) ________ in class 7A? -No, I (be)________ in class 7D. 7. Look! Jane (play)_______ the guitar. This afternoon, she will play table tennis. 8. I (not talk) __________ to her at present 9. How often ________ she (go) ________ fishing? - She (go) _________ once a year. 10. (Be) _______your friends students? -Yes, they (be) _________

nêu cách đánh giặc sáng tạo của nhà trần trong 3 cuộc kháng chiến

ENGLISH 7 UNIT 10 : HEALTH AND HYGIENE I.Choose the word or phrase (A,B,C,D) that best fits the blank space in each sentence. 1.He gets up early in the morning to……………..exercises. A.do B.make C.play practice 2.She was sick , but now she feels ………….a gain. A.good B.well C.best D.badly 3.You have to take care of …………when you are away from home . A.you B.your C.yours D.yourself 4.When you have a toothache, you should go to the……………… A.doctor’s B.dentist’s C.chemist’s D.teacher’s 5.Children should go to bed…………… A.early B.late C.on time D.soon 6.Children are……..of going to see the dentist. A. enjoyable B.pleased C.afraid D.keen 7.My aunt tells us a lot…………you. A. about B.of C. for D.from 8.What ‘s wrong …………you? – You look ill. A. to B. for C. about D.with 9.A dentist looks after people ‘s …………. A. hand B. feet C. mouth D.teeth 10.I can’t chew because I have a (n) ……………… A. headache B. stomachache C.toothache D.cold 11. I hate the …………..of the drill at the dentist’s. A. noise B. sound C.voice D.music 12.I was a little ……..but the dentist was kind. A. scared B. happy C.pleased D.fine 13.I received a letter ………….your aunt last week. A. from B. to C.on D. of 14.I hope you are taking care …………yourself, too. A. in B.on C. from D.of 15.Don’t eat too………candy. A. much B. many C. lots of D.a lot of 16…………..do you brush your teeth ?- Twice a day. A.How B.How often C.How much D.How long 17.Don’t forget to wash……………before meals. A.feet B.hands C.face D.teeth 18.The dentist ………….a cavity in Minh’s tooth. A. did B. made C. filled D. pulled 19. Dr Lai is a dentist at Quang Trung school. She looks ……….all the students’ teeth. A. after B. of C. on D. for 20. After the dentist filled the cavity in his tooth, it stopped………. A.huting B. hurting C.knowing D.playing II. Supply the correct tense or form. 1.The students ( not do ) …………………….their homework now. 2.We( study)………………………..French next month. 3.We ( be)………………………..at the seaside for ten days last summer. 4. ( you/ meet ) …………………………..your friends at the airport tomorrow? 5. Be quiet! The teacher ( talk ) ………………. 6.They ( rehearse )……………….a new play at the moment. 7.They ( buy ) ……………………a lot of souvenirs for their family yesterday. 8.Mr.Binh ( sell)……………………..out all the newspapers this morning. 9.We ( watch ) …………………………..a good movie on TV last night. 10.( they/ wait )……………………………..for their parents now? ( giải giúp mình nha mình cho vote 5 sao)

a) 2x+3=0 b) 5x-4=6(x-3) c) (2x+3)(5x-4)=0

5. giải toán tỉ số a. tìm tỉ số phần trăm của hai số : 2,8 và 80 b. tìm tỉ số phần trăm của hai số : 540 và 1000 c. tìm tỉ số phần trăm của hai số : 19 và 30 6. a. tìm 15% của 335 kg b. tìm 24% của 235 m vuông c. tìm 0,8% của 350 7. tìm một số biết 30% của nó là 720 tìm một số biết 45% của nó là 90kg 8 Một lớp học có 28 học sinh .Số hs nam hơn số hs nữ là 4 em .Hỏi lớp học đó có bao nhiêu hs nam và hs nữ