Đáp án:
$x\in\left[-1;0\right]\cup\left[\dfrac{4}{3};+\infty\right)$
Giải thích các bước giải:
$x(x^2-x+7)(-3x^2+x+4)\le 0$
Vì $x^2-x+7>0\,\,\forall x$
$\to x(-3x^2+x+4)\le 0$
Từ bảng xét dấu $\to x\in\left[-1;0\right]\cup\left[\dfrac{4}{3};+\infty\right)$
x∈[-1;0]∪[4/3;+∞)
Tìm x,biết: x chia hết cho 4,5,6 đều dư 1 và x chia hết cho 7, x < 400
B-WORD PATTERNS Gap filling :fill in the blank with a suitable preposition 8. Take good care ..... that girl of yours , Patrik-she's very special 9. The news report about the explosion turned ..... to be false 10. We need a central bank that is independent .... the goverment 11. Diets are most effective when combined .... exercise 12. She's very keen to leam.... Japanese culture 13. She showed no surprise ... the news 14. The people showed no surprise or anger .... their treatment.
Anh chị giúp em với ạ. Em cảm ơn
Người ta làm một cái hộp dạng hình hộp chữ nhật bằng bìa biết rằng hộp có chiều dài 5 dm chiều rộng 3 di và chiều cao 2 di hỏi có thể xếp được bao nhiêu hình lập phương 1dm khối để đầy cái hộp đó
his/ free/ in/ karate/ brother/ My/ doesn't/ do/ time./
giúp mk vs .mk cảm ơn các bạn nhiều
Mọi người giúp mình chọn câu trả lời đúng với ạ ko cần giải chỉ chọn đáp án đúng
Ex2. Fill in the correct form: Gerund or Infinitive (with or without "TO") 1. I can't afford __________________ a job at the moment. I really need the money. (NOT HAVE) 2. The new job will involve you __________________ some time in Europe. (SPEND) 3. I don't remember __________________ for help. I wonder why he's here. (CALL) 4. We'll get everything finished, even if it means __________________ up late at night. (STAY) 5. She stopped __________________ a newspaper on her way home. (BUY) 6. The members of the council have delayed __________________ a decision. (MAKE) 7. We chose __________________ to Mark's engagement party. (NOT GO) 8. I hate it when the phone keeps __________________ all the time. It's disgusting! (RING) 9. I reminded him __________________ a few things on his way home from work. (BUY) 10. Have you considered __________________ the house? (SELL) 11. My dad insisted on __________________ me the money for the tickets. (GIVE) 12. Our boss convinced everyone __________________ longer hours. (WORK) 13. They couldn't help __________________ when she tripped over the carpet. (LAUGH) 14. Remember __________________ Harriet as soon as you get home. (CALL) 15. Anna denied __________________ the vase. (BREAK) 16. The teacher demanded __________________ why we hadn't cleaned the blackboard. (KNOW) 17. The shop assistant warned us __________________ the flowers. (NOT TOUCH) 18. We are looking forward __________________ you next week. (SEE) 19. I suggested __________________ him there and __________________ back home. (LEAVE, GET) 20. The kidnappers threatened __________________ their hostages. (SHOOT) 21. The thief admitted __________________ the money from the old woman. (STEAL) 22. English is a lot easier __________________ than French or other languages. (LEARN) 23. Mom told her to stop __________________ such strange noises. (MAKE) 24. We are very anxious __________________ a plane for the first time. (BOARD) 25. My husband blamed me for ____________________ have a second child. (NOT WANT)
viết một đoạn văn ngắn từ 5-7 câu về quê hương có sử dụng ít nhất một trạng ngữ, 1 câu rút gọn , một câu đặc biệt ( chú ý : không chép mạng)
$\left \{ {{\frac{4}{x+y-1}-\frac{5}{2x-y+3}=\frac{5}{3}} \atop {\frac{3}{x+y-1}+\frac{1}{2x-y+3}=\frac{7}{5}}} \right.$
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