Giải:
`a < b`
`-> a + c < b + c` (vì `c` dương)
`-> b(a + c) < a(b + c)` (vì `a, b` dương)
`-> a/b < (a + c)/(b + c)` (đpcm)
Ta có :
`a(b+c) = ab + ac`
`b(a+c) = ab + bc`
Vì `a < b` và `c > 0`
`-> ac < bc`
`-> ab + ac < ab +bc`
`-> a(b+c) < b(a+c)`
`-> a/b < {a+c}/{b+c}`
Vậy ta có điều phải chứng minh .
Find and correct the mistakes 1. joe is a badder student than Mia 2.mia is fater than joe. 3. joe isn't older that Mia. 4.joe is moderner than Mia. 5.Mia is friendlyer than joe. 6. Mia is more nice than joe. 7. joe is a gooder football than Mia. 8.joe's pants are shorter Mia's. 9.english is difficulter than french. 10. Mia is a dancer better than joe.
cali chữ: Tạm biệt 6k follower
giúp mk vs mk cần gấp giải thích nữa nha
Nếu tam giác ABC có trung tuyến là AM và trọng tâm là G thì a.AG=GM b.GM=1/2AG c.AG=1/3AM d.AM=2.AG
Tìm độ dài đoạn dây điện biết rằng nếu lấy 1/4 cuộn dây điện bớt đi 1/7 cuộn dây đó rồi gấp lên 3 lần thì được 18m. Ai đúng nhất mình vote 5 sao nhé.
III. Re-write the sentences. Use the passive. 20. Britain’s banks lent nearly £12 billion to successful applicants last year. Nearly £12 billion .................................................................. by Britain’s banks last year. 21. Unfortunately, banks let many people borrow more money than they can repay. Unfortunately, many people .................................................................. more money than they can repay. 22. Some banks lent people a sum that was more than their annual income. People.................................................................. that was more than their annual income. 23. They gave other loans to people who had no source of income. Other loans .................................................................. who had no source of income. 24. Consumer groups say that both banks and borrowers need to face the problem. Consumer groups say that the problem ........................................................................... by both banks and borrowers. 25. They argue that banks should not give loans to people who can’t afford them. They argue that loans .................................................................. who can’t afford them.
câu điều kiện loại 1 ai làm hộ với :( II. Put the verbs in the brackets in the correct tense. 1. If it rains (it/rain), we won’t go (we/not/go) fishing. 2. If__________(the weather/be) beautiful tomorrow, ____________(we/drive) tothe beach. 3. If ___________ (she/send) the letter now, ____________ (they/receive) ittomorrow. 4. ____________ (Fred/be) angry if ___________ (Jack/arrive) late again. 5. ______________ (I/come) to your house if ________(I/have) enough time. 6. If ____________ (she/not/pass) this exam, ____________ (she/not/get) the job that she wants. 7. _______________ (you/learn) a lot if _____________ (you/take) this course. 8. If ____________ (I/get) a ticket, ________________(I/go) to the cinema. 9. ____________ (I/buy) that machine if _______________(it/not/cost) too much. 10. ____________ (you/run) very fast, ______________ (you/catch) the taxi. 11. __________(I/go) to the doctor's if ____________ (I/not/feel) better tomorrow. 12.______________ (they/win) this match, ___________ (they/be) the champions.
Điền từ ago for since (giúp mình với, mình cần gấp)
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