Chứng minh rằng nếu 2 số a , b là 2 số nguyên khác 0 và a là bội của b ; b là bội của a thì : a = b hoặc a = -b

Giúp mình với 😓😓 Mình sẽ cho trả lời hay nhất nếu đúng và nhanh nhất (_cho phân số)

Bài 11. Tìm x, biết: 1) -12( x - 5) + 7( 3 - x) = 5 2) 30 ( x + 2) - 6( x - 5) - 24x = 100 3) ( x + 1) + ( x + 3) + ( x + 5) + ... + ( x + 99) = 0 4) x( x+ 3) = 0 5) ( x - 2) ( 5 - x) = 0 6) ( x - 1) ( x2 + 2) = 0 Bài 12. Tìm số nguyên n để: 1) n + 3 n + 1 2) 2n + 1 n - 2

Bài 1: Số học sinh khối 6 của một trường trong khoảng từ 200 đến 400, khi xếp hàng 12, hàng 15, hàng 18 đều thừa 5 học sinh. Tính số học sinh đó. Bài 2: Một đơn vị bộ đội khi xếp hàng 20, hàng 25, hàng 30 đều thừa 15 người nhưng khi xếp hàng 41 thì vừa đủ. Hỏi đơn vị bộ đội có bao nhiêu người? Biết số người chưa đến 1000. Bài 3 Cho tia Ox , trên tia Ox lấy hai điểm A và B sao cho OA = 3 cm , OB = 7 cm a)Trong ba điểm O , A , B điểm nào nằm giữa hai điểm còn lại ? b) Tính AB ? c) Trên Oy là tia đối của tia Ox lấy điểm C sao cho AC = 4cm. Chứng tỏ A là trung điểm của BC.

Các bạn giải hộ tớ bài này .cảm ơn

Question 81: Such _____ that we didn't want to go home. A. was a beautiful flower display B. beautiful flower display was C. a beautiful flower display was D. a beautiful flower display Question 82: 1 would be very rich now working long ago. A. If I gave up B. If I wouldn't give up C. Were I to give up D. had I not given up Question 83: She has just bought _____ A. a Swiss beautiful brand-new watch B. a Swiss brand-new beautiful watch C. a brand-new beautiful Swiss watch D. a beautiful brand-new Swiss watch Question 84: Everybody is tired of watching the same commercials on TV every night, _____? A. are they B. haven't they C. aren't they D. don't they Question 85: I regret going to the cinema. I wish I _____. A. hadn't gone there B. haven't gone there C. didn't go there D. would not go there Question 86: She spent _____ her free time watching TV. A. a few B. most of C. a lot D. most Question 87: You should take regular exercise _____ sitting in front of the television all day. A. in spite of B. instead of C. without D. even Question 88: They asked me whether I was working _____. A. next day afternoon B. the afternoon followed C. the following afternoon D. tomorrow afternoon Question 89: She played _____ confidently, but her timing was not good. A. a piano B. piano C. the piano D. an piano Question 90: Kate didn't enjoy the roller coaster ride because it was _____ experience of her life. A. the most terrifying B. the most terrified C. a most terrified D. far more terrifying Question 91: Despite playing under strength, our football team, U23 Viet Nam, _____ beat their rivals such as Qatar and Iraq. A. could B. couldn't C. weren't able to D. were able to Question 92: According to FAO, Vietnam is ___ second largest coffee producer in the world after Brazil. A. a B. 0 C. an D. the Question 93: When she came home from school yesterday, her mother _____ in the kitchen. A. cooked B. was cooking C. is cooking D. cooks Question 94: We were made _____ hard when we were at school. A. to study B. study C. studying D. studied Question 95: The 26th Annual Meeting of the Asia-Pacific Parliamentary Forum (APPF) _____ in Hanoi, our beautiful and peaceful capital city, from January 18th to 21st, 2018. A. was held B. is held C. is being held D. will be held

GIÚP MÌNH LỚP MÌNH HỨA CHO 5* I.Choose the best answer. 1.I don’t mind…………………..you with the housework. A.help B. to help C. helping D. helped 2.Can you tell methe difference…………………….these two items? A.of B. for C. among D. between 3.In my country , all the traffic rules are………………followed. A.strictly B. strict C. stricture D. strictness 4. According to…………….., the first person to step into your house in the new year should be a man. A. custom B. table manner C. tradition D. ceremony 5.My brother is sixteen. He isn’t ………………….to drive a car A. old enough B. young enough C. enough old D. enough young 6.The USA is a ………….country with over 80 ethnic groups A. rich B. bi-lingual C. multi- cultural D. ethnic 7.Many people nowadays are……….computers and mobile phones . They use them all day. A. addicted to B. bored C. worried about D. afraid of 8.The left hand is customarily used for cleaning ,………………….Indian people never eat with their left hand. A.so B. but C. however D. and 9.In most festivals , the……………..often begins with an offerings of incense. A. competition B. ritual C. reunion D.worship 10.It is a good car ;…………….the price is reasonable. A. but B. however C. moreover D. otherwise II. Put the following sentences into pasive voive 1.I was washing my clothes when you called 2. People mustn’t park motorbike here. 3. They will build a big hospital nere here. 4. People speak English everywhere. 5. My friend has taught English at this school for a long time 6. My father teaches me English everyday. 7. She told me to wait. 8. Someone took the bicycle a way. III.Complete the following sentences with an approriate form of the word in block capital 1. It’s………………………...for us to solve this problem DIFFICULTY 2. I am…………..with the new decision DISAPPOINT 3. …………..is better than cure PREVENT 4. This painting comes from his private……………… COLLECT 5. I feel…………….. whenever I wear this shirt CONFIDENCE 6. She looks very beautiful in her ………………….costumes TRADITION 7. Wearing uniform helps students feel………… EQUALLY 8. After much ……………from her family and friends , Juliet finally managed to overcome this problem ENCOURAGE IV.Rewrite the following sentences 1.I don’t stay up late any more. I used…………………………………………………….. 2.I drink too much coffee, that’s why I can’t sleep If………………………………………………………………. 3.We knew each other when we were students. We have…………………………………………………………… 4.Unless there is enough water , flwers will die If……………………………………………………………………….. 5.Make some coffee and I will give you a cake If you……………………………………………………………………… 6.I think you should buy this house. If………………………………………………………………………….. 7.I don’t like her much because she is very rude to everybody. If…………………………………………………………………………… 8*.The television is expensive . I bought the television. The television…………………………………………………………….. 9.She’s ill but she goes to work. Although……………………………………………………………………. 10.The tailor has to finish my dress before I leave for Ha Noi. My dress……………………………………………………………………….. 11.I don’t call Lan because I don’t have her number. If I……………………………………………………………………………… 12.Never pick food out of your teeth with your finger nail You……………………………………………………………………………… V.Combine the sentences . Use the coonective in brackets 1. They were very tired. They were sleepy. They went to bed early.( and, so) 2. We were ready to go fishing . It began to rain. We stayed home ( but, so) 3. At first , I couldn’t regcognize Suriyan. He was wearing sunglasses( because) 4.The library closes on Saturday. We should go there on Monday ( therefore) 5. Mrs Lee has gone on a diet. She hasn’t lost any weight. ( however) 6. Are you going to Hue this summer ? Are you going to Nha trang this summer ? ( or) 7. Next Sunday is my mother’s birthday. I don’t know what to give her (but) 8.I sang several songs . I told her many fairy tales. My baby sister didn’t fall into sleep. She missed my mother ( and, but , because)

Mọi người giúp hộ mik bài 3 và bài 4 phần trên

Lập các cặp phân số bằng nhau từ bốn số sau: -4; -8; -16;-32

Câu 1: Trong văn miêu tả, năng lực nào của người viết, người nói được bộc lộ rõ nhất? Vì sao?