Cho hệ pt: $\left \{ {{x+my=9} \atop {mx-3y=4}} \right.$ .Chứng tỏ rằng hệ pt luôn có nghiệm duy nhất với mọi giá trị m

Cho a,b,c thuộc Z.Chứng minh rằng: (-m+n-k+1)-(-m+n-k)+n=n+1

REVISION OF UNIT 8 ( ôn tập thì quá khứ) I. Find the word which has a different sound in the part underlined. 1. A. appear, B. repeat, C. read, D. teach 2. A. washed B. parted C passed D. barked 3. A. worth, B. death, C. breathe, D. thread 4. A. throat, B. wealth, C. south, D. although 5. A. called B. passed C. talked D. washed 6. A. year, B. nearly, C. ear, D. wear 7. A. feather, B. nothing, C. thirteen, D. north 8. A. landed B. needed C. opened D. wanted 9. A. theatre, B. great, C. appear, D ideas. 10. A played B. achieved C. swallowed D. exhausted II. Find the odd one out. (loại bỏ một từ sau không cùng nhóm với 3 từ kia) 1. A. hiking B. swimming C. building D.jogging 2. A. brushed B. swam C. listened D. Visited 3. A. dentist B.nurse C. architect D. work 4. A. went B. had C. prepared D. took 5. A. dance B. sang C. teach D. travel 6. A. game B. show C. weather forecast D. sport remote control 7. A. volleyball B. football C. aerobics D.basketball 8. A. got B. eat C. drank D. won III. Put the verb in brackets into the simple past tense. (chia động từ trong ngoặc với thì quá khứ) 1. I (love) ______ him but no more. 2. Yesterday, I (get) ______ up at 6 and (have) ______ breakfast at 6.30. 3. They (buy) ___________ that house last year. 4. She (not/ go) _____________ to school yesterday. 5. That boy (have) _________________some eggs last night. 6. She (spend) ____ all her money last week. 7. Mum (not/ spend) ___________ any money on herself. 8. I (lend) __________ my penknife to someone, but I can't remember who it was now. 9. John and his father (build) ___________ the cabin themselves last year. 10. My parents (sell) ____________ the stereo at a garage sale. II. Write the positive sentences with negative. ( chuyển đổi những câu sau sang thể phủ định) 1. The Students sticked newwords on the wall to learn vocabulary last Sunday. 2. My friends and I went to the theatre two days ago. 3. He played his electric guitar in the past. 4.We ate in the restaurant yesterday. 5. My schildren arrived at 7 a.m to take me to the airport last week. 6. The doctors wore blue uniform last month. 7. We waited for my mum to take us to school yesterday. 8. They went to hospital in 2018. 9. She went to the supermarket and bought some food last week. 10. They opened a new library two months ago. IV. Rewrite the following sentences, beginning as shown, so that the meaning stays the same: Structure: 1. I last played the piano two days ago. 2. It is two days since I last played the piano. 3. The last time I played was two days ago. Ex 1: 1. I last came to the karate three days ago.  It is ______________________________________________. 2. She last went to the gym one week ago.  The last time______________________________. 3. It is four years since he last did boxing.  He last __________________________________. 4. The students last went boating two months ago.  It is __________________________________________. 5. My friends last went scuba driving three weeks ago.  The last time _______________________________________. 6. It is four days since they played marbles.  They last _______________________________________. 7. The last time my mother bought this bicycle for me was two years.  It is ______________________________________________. 8. I last went kayaking days ago.  The last time _____________________________________________. 9. The last time the cycled round the lake with her friends was four months ago.  She last __________________________________________. 10. They last played some games two hours ago.  It is ______________________________________________. -----The end -----

quan sát các hình 36.2 và 36.3 giải thích tại sao có sự khác biệt về khí hậu giữa phần phía tây và phần phía đông kinh tuyến 100 độ của hoa kì

các bạn chỉ cần làm bài 3 thui nha🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻🙏🏻 cầu xin các cao nhân giúp đỡ, tôi là người trọng nhân tài

|x|bằng -5 |x|bằng 7 |-x|bằng -9

Giải phương trình sau(dưa các phương trình da cho vềdạng phương trìnhbậc nhất hoặc phương Trình Tich (2y-1)^2-(y+3)^2=0

Giúp em câu 22 đến 30 nha e cảm ơn nhiều ạ

REVISION OF UNIT 7: A. Pronunciation: I. Find the word which has a different sound in the part underlined. 1. A. the B. there C. think D. they 2. A. earth B. feather C. theater D.thanks 3. A.clumsy B. cute C. study D. but 4. A. weather B. newsreader C. teacher D. repeat 5. A. brother B. through C. then D. weather B. Vocabulary & Grammar. I. Find which word doesnot belong to each group. 1. A. director B. viewer C. audience D. watcher 2. A. international B. local C. national D. boring 3. A. studio B.cartoon C. world news D. documentary 4. A. newsreader B.programme C.comedian D.film produce 5. A. reporter B. educational C. exciting D.popular II. Choose the best item among A, B, C or D to complete the sentences. 1. The program can both _________and entertain young audiences. A. educated B educational C education D educate 2. The _________I like best is Hoai Linh A. comedy B. comedian C. fun Dfunny 3. VTV is a __________ TV channel in Viet Nam. It attracts millions of TV viewers in Viet Nam. A. national B. international C. local D. wide 4. What is your ___________ TV programme? A. best B. good C. favourite D. like 5. My family enjoys watching game shows __________ they are very exciting and interesting. A. so B. because C. but D. and 6. ________ do you like the modern English programme. Because it helps me with my English. A. What B. Where C. Who D. Why 7. My father likes watching sports __________ on VTV3. A. channels B. events C. athletes D. matches 8. _________do you watch TV a day? Once a week. A. How many B How often C How far D How old 9. _________ are films by pictures, not real people and often for children. A. Documentary B. Cartoon C. love stories D. Detective story 10.________ are the children? They are playing in the front yard. A. What B. where C. which D. Why III. Give the correct form of the verb in bracket. 1. ______you (watch) ______ your favourite programme? 2. Can you (give) __________ me the newspaper on the desk? 3. You should (check) _________ the TV schedule. 4. The weatherman always (give) ___________ a weather forecast every day. 5. The newsreader (read) _________ out the reports on a TV or radio news programme. 6. You can (use)_______ a remote control to change the channel from a distance 7. _________ she (watch) _______ a game show after 11o’clock? 8. What ____ he (learn) __________ through games and shows? 9. What time _______they (watch) _________ sports events? 10. They always (work) _________ hard every day to produce quality programme for TV. V. Complete the following sentences with the words in the box: and but so because although 1. Children love cartoons ________ they make them feel happy. 2. ________ the newsreader speaks really fast, my father can hear everything. 3. The animal programme is so late ________ I can’t wait for it. 4. Some game shows are popular, __________ I never watch them. 5. My sister is a weatherwoman _________ my father is a newsreader. IV. Reading: 1. Read the topic and fill in each blank with the words in the box: favorite, are, on, comedies, funny, both, TV, comedian, cartoon There (1)_______ a lot of cable television channels today. People also produce numerous interesting program to entertain people. The (2)__________program tells us what is happening around the world. The (3)________makes us laugh and relax after long working hours. The (4)________ has cute character. Some program an (5)________ educate and entertain young children such as ‘Let’s Learn’ (6)______ VTV2. My (7) ___ ____ program is the game show “ Who wants to be a millionaire?”. My favourite (8)_____ is Truong Giang. He is very (9) _______________. 2. Read the topic again and answer the questions. a. How many cable television channels are there today?  __________________________________________________ b. Which programme do you like best?  ______________________________________________ V. Writing: 1. Make questions for the underlined part. a. There are 35 students in my classroom.  _______________________________________________________? b. My brother is studying in his bedroom.  _________________________________________________? c. My favourite singer is My Tam.  ___________________________________________________? 2. Rewrite the sentences. a. What is her favourite programme?  What ____________________________? b. I enjoy watching TV.  I am interested __________________________. c. What is your address?  Where _____________________________? ----The end -----

: Cho ba điểm A, B, C thuộc tia Ox sao cho OA = 2cm, OB =6cm, OC =4cm a) Hỏi trong bộ ba điểm ( O, A, C); ( O, B, C) điểm nào nằm giữa hai điểm còn lại? b) So sánh AC và CB c) Chứng tỏ C nằm giữa A và B. làm hộ mình với nhé