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Bài 2: Bài toán giải phương trình Tình Huống 1: Nhân thừa số vào trong ngoặc, chuyển vế đổi dấu hạng tử đưa phương trình về dạng: a.x= b. 1, 3x-7=13-x 1, 4(x+2)-1=x-5 2, -7(-x-2)+3(2-x)=3x+1 2, 5x(x-6)-2x+12=0 Tình Huống 2: Nhân đơn thức với đa thức, nhân hai đa thức rồi chuyển vế đổi dấu hạng tử đưa phương trình về dạng: a.x = b 3, -x(x-2)-(3-x)2x=x^2-5 3, (2x+1)^2 -x(4x+3)=2x-2 Tình huống 3: Biến đổi, dùng hằng đẳng thức, đặt nhân tử chung đưa phương trình về phương trình tích. 4, (x-2)(2x-1)=5(x-2) 4, 9x^2-3=(3x+1)(2x-3) 5, x^2 -25=(2x-1)(x+5) 5, (x+2)(4-x)=x^2+4x+4 Tình huống 4: Quy đồng mẫu số hai vế, rồi bỏ mẫu số chung. 6, 2x-3/4+2=1-x/6 6, x+2/6+x=2x-3/8 7, (2x-3)(x-2)/4 7, (x+2)(x-1)/6+x(x-1)=(2x-3)(x-1)/8 Tình huống 5: Phân tích các mẫu thức thành nhân tử rồi quy đồng mẫu thức từng vế (hai vế) của phương trình. 8, 3x/x-5+1/x=4x+3/x(x-5) +3 8, 1/x+1+5/2x=15/(x+1)(2-x) 9, x+5/x-5-x-5/x+5=x(x+25)/x^2-25 9,x+2/x-2-x-2/x+2=-4/4-x^2 10, x-2/x+2-x^2+2/x^2+2x=3/x 10, x+2/x+1-3/2-x=3/x^2-x-2 +1 11, 1+1/x+2=12-2x/x^3+8 11, 1/x+1+2x^2+1/x^3+1+2x^3-2x^2/x^2-x+1=2x VOTE 5 SAOOOOO + Cảm Ơn

Exercise 6: Combine each pair of sentences using a suitable compound word. 1. John went to the show. He forgot his wallet. 2. The team will play together. They will lose the game. 3. The class is quiet during the test. They will not pass. 4. We looked everywhere for my brother. We could not find him. 5. Kerry went to the woods. She went hunting. 6. John loves to watch the movie Transformers. He loves to eat popcorn. 7. One of the greatest sports is tennis. Tennis is not watched very much on television. 8. The dog must eat dinner on time. He will be hungry. 9. David likes to play baseball. He loves to play soccer too. 10. Amanda needs to study harder. She will not graduate this year. Exercise 7: Complete the sentences with conjunction: and, or, but, so. 1. We needed some food for the week, .................. we went to the supermarket. 2. Alan invested a lot of money in the business, .................. the business went bankrupt. 3. Doug didn’t understand the homework assignment, .................. he asked the teacher for help. 4. Susan thinks she should stay home and relax, .................. she should go on vacation. 5. The doctors looked at the x-rays, .................. they decided to operate on the patient. 6. Tom asked his teacher for help, .................. he asked his parents. 7. Jack flew to London to visit his Uncle, .................. to visit the National Museum. 8. It is sunny, .................. it is very cold. 9. Henry studied very hard for the test, .................. passed with high marks. 10. I would like to play tennis today, .................. I would like to play golf. Exercise 8: Match each clause in column A with a clause in column B then match those pairs with suitable compound words. No. A Opt. B 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. You can look at the clothes in the shop windows. I was tired, Mrs. Taylor is tall Learning geography is difficult It is raining heavily outside, The exercises are quite difficult, I don’t know whether to turn left, Do you want to sit next to Nam No one likes classmates who are lazy You didn’t win the prize, A. B. C. D. E. F. G. H. I. J. so I went home early. so we’d better postpone ourpicnic. and Lan? but I’m doing quite well. and slim. so better luck next time. or you can’t go in and buy them. or right to reach thedepartment store. but interesting. and mean. 1 – 2 – 3 – 4. – 5 – 6 – 7 – 8 – 9 – 10 – Exercise 9: Insert the given words in right positions and rewrite the correct sentence. (You can use “,”if necessary). 1. To make this hand-cut flower, you need paper scissors. and 2. Shall we play tennis watch TV? or 3. l will have an exam next week, I haven’t learned anything but 4. I have to work overtime I can’t feed the dog on time. so 5. We knocked at the door, no one answered. but 6. The weather is hot in summer, we wear light clothes. so 7. My father is a doctor my mother is a shop assistant. and 8. I have a toothache I must see a dentist as early as I can. so 9. I love collecting stamps dolls. and 10. The TV is on, nobody is there watching. but HELP ME! PLEASE. CAN YOU DO IT EARLY =(((

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