Cho hệ phương trình x 2y 3 m 2x y 3(m 2) a) Giải hệ phương trình khi m = -1. b) Tìm m để hệ có nghiệm duy nhất (x ; y) sao cho S = x2 + y2 đạt giá trị nhỏ nhất
Cho tam giác vuông có hai cạnh góc vuông là 52 cm và 34 cm Hãy tính diện tích tam giác vuông đó
Bài 1. Điền số thích hợp vào chỗ chấm: 1km = …………..hm 1mm = …………cm 1hm =……………dm 1dm = …………..m 1km = ……………m 1mm = ………….m 204m = ………….dm 36dm =…………..m 148dm =…………cm 70hm =………….dm 4000mm = ………m 742km = …………hm 1800cm =…………m 950cm =………….dm
Hãy chứng minh đời sống của chúng ta sẽ bị tổn hại rất lớn nếu mỗi người ko có ý thức bảo vệ môi trường sống
cho x,y >0 chứng minh rằng 1/x+1/y >=4/x+y thanks ạ
Các cô các a chị làm giúp e bài tiếng Anh này với
làm gấp (vote 5 * câu tl hay nhất)
Trình bày vai trò của vitamin và muối khoáng đối với cơ thể? Em cần gấp:((
Question I. Find the word which has different sound in the part underlined 1. A. far B. vast C. safe D. fast 2. A. badminton B. ice-cream C. like D. write 3. A. home B. house C. homeless D. hour 4. A. girl B. goal C. general D. green Question II: Choose the best option to complete the following sentences. 1. I have known Peter………………..two years. A. with B. for C. since D. in 2. Nam……………………….eating fast food because it’s not good for his health. A. loves B. enjoys C. hates D. like 3. I find …………… interesting because I can stay in shape. A. swim B. swimming C. to swim D. swim 4. I ………………. my mother to clean the rooms yesterday. A. helped B. helping C. to help D. have helped 5. Do ……………. exercise or you’ll put on weight. A. less B. more C. little D. many 6. My ………………. is collecting stamp. A. things B. work C. job D. hobby 7. I think you should take up swimming because it is ………. for your health condition. A. for B. with C. at D. of 8. I want to raise money for ………………….. children and give them food. A. home B. street C. road D. blood Question III: Read the text and answer the questions. My father has unusual hobby, carving eggshells. As everyone knows, eggshells are very fragile. My dad can make beautiful pieces of art from empty eggshells. It’s amazing. He started the hobby five years ago after a trip to the US where he saw some carved eggshells in an art gallery. My father did not go to class to learn how to carve. He learned everything from the Internet. I am my father’s son. My name is Ba. I like carving eggshells, too. 1. What is the name of the hobby? A. Carving eggshells B. eggshells C. carving wood 2. When did he start the hobby? A. 4 years ago B. 5 years ago C. 6 years ago 3. Did he go to class to learn how to carve? A. Yes, he did B. No, he did C. No, he didn’t 4. Where did he learn to carve? A. From his friend B. from the US C. from the Internet. Question IV: Complete the text with the verbs in the box in the correct form. Maybe some verbs can be used more than once. go listen play watch Rick has a lot of hobbies. He (1) ______________ chess at school and he also (2) ______________ skating. After dinner, he (3) ______________ for a walk and he (4) ______________ to music every evening in his room. Rick loves sports. He (5) ______________ athletics at school, and he (6) ______________ football after school. On Saturdays, Rick and his friends (7) ______________ swimming. On Sundays, they (8) ______________ basketball. Question V. Combine these sentences using given words (1p) Example: He does more exercise. He is putting on weight. (because) =>He does more exercise because he is putting on weight. 1. He stayed at home. He was sick. (because) =>…………………………………………………………………………… 2. It was very cold. They went swimming. (but) =>…………………………………………………………………………………… 3. We can go camping. We can go for a picnic. (or) =>…………………………………………………………………………………… 4. He had a stomachache. He didn’t wash his hands. (so) =>…………………………………………………………………………………… Question VI. Give the correct form of the following verbs. 1. My dad enjoys ____________ his bike to work. (ride) 2. She ___________ out with her friends last night. (go) 3. I__________ in Ha Giang since 2009. (live) 4. They usually___________ a lot of beautiful photos. (take)
(-12).47+(-12).57+(-12) dấu chấm là dấu nhân nha
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