Mn giải nốt bt này cho e vs e cảm ơn

Đốt cháy 3,1g photpho trong bình chứa 5g oxi.sau phản có chất nào còn dư?

Chứng minh phương trình không có nghiệm nguyên: a, x^3+y^3=2004

Giải phương trình a)(x^2-4)+(x-2)(2-3x)

Trong mặt phẳng tọa độ cho tam giác ABC có A(1;4) ; B (2;-3) ; C (1;-2) 1/ tìm tọa độ trọng tâm G của tam giác ABC 2/ tìm diện tích tam giác ABC

II. Read the following text, and then answer the questions. Bike safety – Children under 10 should always ride with an adult. – You must wear an approved cycle helmet correctly. – Make sure bikes have working brakes. – Wearing a high visibility vest or jacket, especially at night, is a good idea. – You should copy the way you see your parents riding their bikes. 1. At which age can children ride their bikes alone? _____________________________________________________ 2. What must you wear while riding? _____________________________________________________ 3. What should your bike have? _____________________________________________________ 4. What should you wear when you ride at night? _____________________________________________________ 5. Is the way your parents ride their bikes a good example for you to follow? _____________________________________________________ III. Read the texts about model good road safety behavior at all times for parents, and then answer the questions. Top tips for pedestrian safety – Teach your children to hold hands with an adult whenever they go out. – Always use a zebra crossing when one is available and teach children that these are the safest places to cross. – Teach children that it’s still important to stop, look and listen at a zebra crossing. – Teach children always to stop at the kerb and look and listen for traffic (a third of children injured on roads said that they didn’t stop before stepping off the kerb and many said they didn’t look). – Never use your mobile phone while crossing roads. – Children learn to make decisions about crossing the road and parents gradually let them take a lead when you are crossing together. – As children get older, practise routes with them before they walk alone. Top tips for cycling – Always encourage children to wear a cycle helmet when they are on their bikes, and set a good example by wearing one yourself. – Children need to be able to judge speed and distance accurately before they cycle on public roads. They need to take lessons on cycling in order to travel more widely on their bikes. – Make sure children wear bright coloured clothing and fluorescent items whenever they are cycling on the road. And if they are cycling in the dark, they will need lights on their bikes and reflective items too. And of course, make sure you do this yourself, to set a good example. 1. What should children do when they go out? _____________________________________________________ 2. Where should children cross the street? _____________________________________________________ 3. What should children do to cross the street? _____________________________________________________ 4. Where should children stop to look and listen for the traffic? _____________________________________________________ 5. Can they use their mobile phones while crossing roads? _____________________________________________________ 6. What should parents do to help older children before they walk alone? _____________________________________________________ 7. What should children wear when they are on the bikes? _____________________________________________________ 8. What should children do before they cycle on public roads? _____________________________________________________ 9. Which clothes should children wear whenever they are cycling on the road? _____________________________________________________ 10. What should they do when they cycle in the dark? _____________________________________________________

mọi người giúp mik với mik đang cần gấp. văn 6. cảm ơn trc viết bài văn tả cảnh mùa xuân đã về trên quê hương em viết một bài văn tả cảnh sân trường trong buổi chào cờ giúp mik với !!!!!!!!

- Có mấy loại lao động ? Nêu ý nghĩa của lao động ?

giúp mk vs ạ.. mk cần gấp C.ơn luôn ak

ai giúp vote 5 sao I. Pronunciation 1). Choose the word which has a different sound in the part underlined. 1.A. thankful B. there C. thermal D. thorough 2. A. growth B. show C. crown D. know 3. A. display B. dirty C. invent D. investigate 2). Choose the word which has a different stress pattern from the others. 4. A. historic B. physical C. aquatic D. botanical II. Choose A, B, C, D for each gap in the following sentences. 1Many fish in my lake have died because of the ………… water A. pollute B. pollution C. polluted D. polluting 2.My teacher always give us a clear ……….. A. explain B. explained C. explanatory D. explanation 3. You can see ………on the Canadian national flag A. the maple leaf B. the red leaf C. the rose D. the oak tree 4.Mary is ……most beautiful of ……three sisters. A. the/the B. a/the C. the/no article D. a/no article 5.Coal, oil and forests are the most important ……..resources A. industrial B. agricultural C. natural D. national 6. Vy had…..stomachache because she ate a big dinner. A. a B. an C. the D. no article 7. Have you taken notice …..the “stop” sign. A. at B. of C. to D. from 8.The Statue of Liberty is a major monument in New York which ……..freedom A. attracts B. symbolises C. decide D. understand III. Give the correct form of the words given to complete the sentences: 1.Are all type of pollution …….to the health of humans and animals HARM. 2. The polluted water results in the …….of many aquatic animals and plants. DIE 3. Both French and English are ……..language in Canada. OFFICE 4………habitats have been destroyed in recent year NATURE IV. Give the correct form of the verb. 1. If we meet at 9:30, we (have)………..plenty of time. 2. If you (find) …………a skeleton in the cellar, don't mention it to anyone. 3. The zookeeper would have punished her with a fine if she ( feed) ……….. the animals.. 4. If we send an invitation, our friends …..(come) to our party. V. Fill in each numbered blank with one suitable word or phrase . Acid rain will not be an easy problem(1)……. As more and more countries become …(2)… there will be more and more competition for petroleum for cars, home heating and industry . While ….(3)….petroleum contribute greatly…(4)….acid rain, it is less polluted than coal. Unfortunately, petroleum is more ..(5)…than coal and no one knows exactly ..(6) … petroleum is left. Therefore, there will be a pressure to burn coal for energy. Coal is a ..(7) ..dirtier energy source than petroleum. Since we already know how …(8).. acid rain is, it is important ..(9)… we increase our efforts to find a ..(10)…. Source of energy as quickly as possible, so that we can avoid further environmental damage. 1. A. solve B. to solve C. solved D. solving 2. A. industry B. industrial C. industrialize D. industrialized 3. A. firing B. shooting C. burning D. cooking 4. A. to B. for C. at D. with 5. A. expensive B. cheap C. clean D. dirty 6. A. how many B. how much C. how far D. how long 7. A. so B. many C. lot D. much 8.A. destroy B. destroyed C. destruction D. destructive 9. A. that B. if C. weather D. which 10. A. polluted B. polluting C. non-polluting D. non- polluted VI. Rewrite the sentence 1. Although he had a good salary, he was unhappy in his job. In spite of ………………………………… 2.He gets up early in the morning and he used to it. He is used to ………………………………… 3.He doesn’t study hard so he will fail the final exam next month. If………………………………………. 4.I will stay at home unless I am invited If……………………………………………………….