Một bóng đèn dây tóc ở nhiệt độ 20°C có điện trở là 11 ôm. Tính chiều dài dây tóc biết tiết diện tròn của dây có bán kính 0,02mm và dây làm bằng vonfram có điện trở suất 5,5.10–8 ôm mét?

Chứng minh rằng tài nguyên sinh vật nước ta có giá trị to lớn về các mặt sau đây: - Phát triển kinh tế - Bảo vệ môi trường sinh thái.

Exercise 3: Report the following questions. 1. "Is Sue coming to the library with you, Paul?" → Tina asked Paul 2. "Have you done your homework yet, Peter?" →Mum asked 3. "Can you help me with the housework tomorrow, Linda?" →He asked Linda 4. "Are you going to buy a new computer next month, Lewis?" → I wanted to know 5. "Will you help your brother this evening, Pam?" → Peter asked 6. "Does your mother still cook her tasty curry, Peter?" → Sarah asked 7. "Did you see John yesterday, Mai?" → Bam wanted to know 8. "Do you know how to operate this machine, Anne?" → Dan wanted to know 9. "Are you going to make an appointment with Mrs Jones this week, → Dan asked 10. "Can you come home for dinner tomorrow?" → Donald asked us Exercise 4: Report the following WH-questions. 1. "Where are you going to spend your holiday this summer, Sue?"" → Mary asked Sue 2. "What time does the new TV series begin tonight?" →Terry asked 3. "When has Tim started working this morning? →Mr. Smith asked his secretary 4. "What will you do to help your mother, Tom?" →Dad wanted to know 5. "How often do you play chess with your brother, Alice?" →Sam wanted to know 6. "How does this computer work?" →John wondered 7. "Who invented the telephone, Penny?" → Alan asked 8. "What time are you meeting your friends this afternoon?" →My parents asked me 9. "Where are you going to study Arts next year, Tina?" →Mr. Black asked 10. "How much will you spend on your holidays next summer?" → Rachel asked us Giúp mình vs mình đag rất cần

Exercise 2: Report the following statements. 1. "I go to the cinema with my friends on satturdays" => Peter said 2."students don't like tôi much homework" - he Said 3 "I don't visit my relatives next week" - charles said 4."my brother didn't like playing tennis" -henry said 5."this is my favourite him" -Barbara said 6. "Sara will hold a party tonight" -perter said 7. "We were at home all day to finish our assignments" - Tom and jack said 8. "I buy new clothes every weekend" - brenda said 9. "This place is absolutely wonderful" -Sam said

1. Nhập vào dãy số tính trung bình cộng các phần tử vừa nhập 2. Nhập vào dãy số in ra màn hình dãy đc sắp sếp theo thứ tự tăng dần 3. Nhập vào dãy số in ra màn hình dãy số được sắp sếp theo thứ tự giảm dần Giúp mình vs ạ

Viêt lại câu sao cho nghĩa không đổi 5) They are interested in playing football. Theylove... They 6, My father had watered all the plants in the gard mother came home. → Before 7 She thinks that no city in her eyes is more beatiful ->she thinks Hoi An.... 8, I had done it before he arrived. After... Giúp mình vs ( cho mình xin công thức)

Viết lại câu sao cho nghĩa câu ko đối 1 he started playing table tennis three mouth ago -> he has 2. This is the first time he went to England -> he hasn't 3.my friend had gone home be fore we arrived -> after 4. I had break fast then I wen to school -> be fire 5. They are intere sted in phay foot ball -> they love 6.my father had watered all the Gartner mother came home -> be fore