Đáp án:
\( - 185dm/{s^2}\)
Giải thích các bước giải:
Phương trình gia tốc:
\[\begin{array}{l}a = - {10^2}.12\cos \left( {10t + 20} \right)dm/{s^2}\\t = 1:a = - 1200\cos \left( {10.1 + 20} \right) = - 185dm/{s^2}\end{array}\]
8abc-abc8=5418 .
V. Fill in each blank with a suitable preposition. 1. I am interested __________ reading books. 2. She is tired __________ living in the city. 3. This restaurant is famous __________ Chinese food. 4. The ambulance will be there __________ about 5 minutes. 5. Bobby started school __________ the age of five. 6. I am very keen __________ music. 7. Na got up late this morning because her alarm clock didn’t go __________. 8. I’m looking forward __________ seeing in June. 9. Could I help you __________ your bag? 10. They are traveling to the airport __________ a bus. VI. Read the following passage and choose the best answer for each gap.TH EDUCATION 127 Đặng Văn Ngữ. Quận Đống Đa. Hà Nội. 04 6663 5665 http://www.th.education Ms Oanh_Class 5.3 TRANG 3 TRUE LEARNING – TRUE TEACHING These days most people, especially young girls, like (1) _____ slim. Our grandfather’s tastes were different (2) _____ ours but nowadays (3) _____ seems to enjoy (4) _____ fat people. The only thing (5) _____ is wrong with this is what a (6) _____ said to me the other days: “I don’t mind (7) _____ these foods if they will help me (8) _____ weigh but why do they taste so awful?” The reason (9) _____ this is that the manufacturers have to include a lot of vitamins to satisfy the law, so the only sensible advice I could give my friend was “Eat normal food, but (10) _____ less.” 1. A. to looked B. to look C. they look D. look 2. A. from B. of C. as D. with 3. A. anymore B. none C. everyone D. no one 4. A. to look at B. looking C. looking at D. to look 5. A. it B. that C. what D. who 6. A. friend of mine B. my friend C. friend of me D. friend of my 7. A. to eat B. eat C. eating D. the eating 8. A. gain B. put on C. loose D. lose 9. A. of B. why C. for D. that 10. A. eat B. to eat C. eating D. be eating VII. Read the following passage, then answer questions 1-5. It is five o’clock in the evening when Rene Wagner come home from work. She walks into the living room and looks at her three children. They are 14, 13 and 9 years old. They are watching TV. The living room is a mess. There are dirty socks on the floor and cookies on the sofa. Games and toys are everywhere. Rene is angry, “this place is a mess” She tells her children, “I can’t work all day and then do housework all evening. I’m not going to do housework!” Rene doesn’t wash clothes, either. Every evening she sits on the sofa and watches TV. After two weeks, every plate, fork and glass in the house is dirty. All the children’s clothes are dirty. Every garbage basket is full. The house is a mess. Then, one day Rene comes home from work and gets a big surprise. The kitchen is clean. The children clean the kitchen! The next day, the living room is clean, and the children are washing their clothes. Rene tells the children “OK, I’ll do the housework again. But you have to help me.” Now Rene and her three children do the housework together. Then they all sit on the sofa and watch TV. 1. When Rene came home from work, she found the house ______. A. clean and dirty B. dirty and tidy C. dirty and untidy D. clean but untidy 2. Rene told her children ______. A. to do the housework B. she couldn’t do housework C. not to do housework D. she wouldn’t do housewor
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