` `
Đáp án:
`a)S={25/18}`
`b)S={1}`
`c)S={27}`
Giải thích các bước giải:
`a)(4x+1)(x-3)=(x-7)(4x-1)+15`
`⇔4x²-12x+x-3=4x²-x-28x+7+15`
`⇔4x²-11x-3=4x²-29x+22`
`⇔4x²-11x-4x²+29x=22+3`
`⇔18x=25`
`⇔x=25/18`
Vậy `S={25/18}`
`b)(x+1)(x²-x+1)-x(x²-3)=4`
`⇔x³+1-x³+3x=4`
`⇔3x+1=4`
`⇔3x=4-1`
`⇔3x=3`
`⇔x=3:3`
`⇔x=1`
Vậy `S={1}`
`c)(x-3)(x²+3x+9)+x(5-x²)=6x`
`⇔(x-3)[x²+x.3+3²]+5x-x³=6x`
`⇔x³-3³+5x-x³=6x`
`⇔5x-27=6x`
`⇔5x-6x=27`
`⇔-x=27`
`⇔x=-27`
Vậy `S={-27}`
II. Choose the best answer a, b, c or d to complete the sentence. 1. How much time do you spend _______ leisure activities? a.on b. in c. for d. with 2. Why don’t you apply for this job? It looks right _______ your street. a.on b. in c.at d. up 3. Daisy is _______ social media. She spends lots of time on Facebook and Instagram. a.tired of b. bored with c. addicted to d. curious about 4. How much time do you spend _______ TV every day? a. watch b. to watch c. watching d. in watching 5. I’d hate _______ the exams, so I’m doing my best. a. failing b. to fail c. fail d. failed
Giúp em giải chi tiết bài này với ạ
X. Rewrite the sentences without changing the meanings. 1. The garden is behind Nam's classroom. Nam's classroom........................................................................... 2. There are four people in her family. Her family.................................................................................. 3. My house is behind the hotel. The hotel..................................................................................... 4. My room is smaller than your room. Your room.................................................................................... 5. No house in the street is older than this house. This house.................................................................................... 6. My house has four floors. There......................................................................................... 7. My school has six hundred students. There....................................................................................... 8. The Red River is 1,200 kilometers long.The Nile River is 6,437 kilometers long The Nile River is much ....................................................... 9. Mr Pike's nationality is Australian. Mr Pike comes..................................................................... 10. What is the age of Peter? How.....................................................................................?
IV. Fill in each blank with a suitable preposition. (điền giới từ) 1. Carpentry isn’t right ________ my street. I’d rather pay someone else to do it. 2. What do you usually do ________ your leisure time? 3. Today, teenagers rely ________ technology more than in the past. I. Choose the word whose underlined part is pronounced differently from the others. 1. A. flat B. hat C. casual D. equal 2. A. question B. location C. nation D. animation 3. A. design B. side C. picnic D. advice 4. A. learned B. dressed C. guided D. wanted
Điền câu điều kiện loại I, II nhé!
Vẽ cho mình đâuj mầm có quấn cái khăn trên đầu nha
bài mỗi 2 câu nên giúp tớ nhen cảm ơn^^
Gải nhanh hộ em giúp em bới nhab hộ em đc k ạ
Cho tam giac ABC co ba goc nhon, duong cao BD, CE cat nhau tai H. a)Chung minh: AE.AB = AD.AC b)Chung minh: goc ABC bu voi goc CDE HELP CÂU B
Vẽ đậu mầm cute. NL: Kể tên cho mình một số app vẽ cho người mới học vẽ
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