Đáp án:
` x=13/12`
Giải thích các bước giải:
1.` x+1/4=4/3`
`<=>x=4/3-1/4`
`<=>x=(16-3)/12`
`<=>x=13/12`
Vậy `x= 13/12`
2.`(x+1)/4=4/3`
`<=>3(x+1)=4.4`
`<=>3x+3=16`
`<=>3x=13`
`<=>x=13/3`
Vậy `x=13/3`
`x + \frac{1}{4} = \frac{4}{3}`
`x = \frac{4}{3} - \frac{1}{4}`
`x = \frac{16}{12} - \frac{3}{12}`
`x = \frac{13}{12}`
Vậy `x = \frac{13}{12}`.
Chúc học tốt!!!
I.Choose the best answer to complete these following sentences. 1. People ................. that the earth is round before. A. were not used to believe B. used to believing C. would not use to believe D. did not use to believe 2. These city girls are used ................. in the field. A. to work B. used to lie C. would like D. to working 3. I am sorry I am not ................. fast. A. used to drive B. used to driving C. use to drive D. use to driving 4. Frank used to work in a small shop. He ................. A. doesn’t any more B. still does C. is now D. had never done anything else 5. I ................. in Jakarta. I’ve lived here all my life. A. am used to living B. used to living C. use to live D. am used to live 6. When I was a child, I ................. anyone 40 was old. A. used to think B. was used to thinking C. used to thinking D. was used to think II.Changed into negative and interrogative or question form.( chuyển sang 2 dạng còn lại ) 1. They used to play tennis twice a week. 2. I used to go to the gym three times a week. 3. Did Tennis use to be a sport for rich people only? 4. My father used to take me to see soccer games on Saturday. 5. Did He use to buy a new tennis racket.? …………………………………………………………………………………. III> Give the correct form of the verbs in brackets: used to + V or simple past. 1,I (not play) .................................computer games when I was a child, but now I (play) ................................... a lot of games in the evening. 2. Mike (not smoke) ................................... before going to the army. 3. There (be) ..................three parks in our village, but now there (be) ................... only one. 4. Murat (like) .................................. cheeseburgers, but now he (eat) .................................. healthy food. 5. She (not cook) ................... before she got married, but now she (cook) ................................... everything. 6. Alex (not have) ............................. a mobile phone, but now he (send) .............................. text messages easily. 7. When I was single, I (have) ................................... big parties in my house, but now I (watch) ................................... TV in the evenings. 8. When I was in Vietnam, I (watch) ....................... football matches at the stadium. Now I (watch) ................................... on TV every weekend. 9. A: you (drink) ...... a glass of milk every morning when you were a child? B: Yes, I did, but now I (drink) ................ a cup of coffee every morning. 10. My sister (love) ............................... classical music, but she (hate) .............................. it when she was younger. IV. Rewrite the sentences with "used to". 1. They often went to Da Lat in the summer. They 2. We usually played soccer in the past. We 3. I got up earlier when I had work. I 4. Tom did his homework in the evening. Tom 5. Lan wrote to Mary twice a month. Lan 6. He worked at night when he worked in the supermarket. He 8. She played badminton in her free time. She………………………………………………. 9. They went swimming in the afternoon in 1990. They 10. He was a doctor in that hospital. ->He………………………………………………………………………….. V.Matching A B 1…. I was very fit when I was young. 2. …..The teachers at my school were kind. 3….. My brother’s room was so messy. 4…. I had a dog when I was a kid. 5… My family had some lovely holidays. 6… When I was young, we didn’t have a car. 7. …And we didn’t have central heating. 8. …….My uncle was a pilot for Vietnam Airlines. 9. …..My father was weak. 10…… My brother was a soccer player. a. He used to smoke a lot. b. He used to play for the local team. c. It used to follow me everywhere. d. We used to go everywhere by bus. e. We used to freeze on winter mornings. f. He used to fly Airbus. g. He never used to tidy it at all. h. I used to do a lot of exercises. i. They used to help pupils. j. We used to go camping all over the country.
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