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một cửa hàng bán một bàn ủ điện được lãi 20 phần trăm theo giá bán .Hỏi người đó lãi bn theo giá vốni li

giúp mik nhé, hứa vote nhanh + đúng = ctlhn

Tìm m để f(x) = mx^2 - 2x + 5m^2 - 4 >= 0 với mọi x > 1. Mọi người giúp e câu này với ạ!

Question 40: Nam helps people in need much. He feels much happy. A. The more Nam helps people in need, the happier he feels. B. Nam helps people in need more, he feels much happy. C. Nam helps people in need much, the happier he feels. D. The most Nam helps people in need, the happiest he feels GIẢI THÍCH

Câu 4 : Để biểu thức (3x + 4) - x không âm giá trị của x phải là : A. x ≥ -2 B. -x ≥ 2 C. x ≥ 4 D. x ≤ -4

EXERCISE 6: 1. He said to her : “ You are my friend. ”  ............................................................................................................................................... 2. John said to his mother, “ I don’t know how to do this exercise. ”  ............................................................................................................................................... 3. Paul said, “ I must go home now. ”  ............................................................................................................................................... 4. John said, “ I have finished studying my lesson. ”  ............................................................................................................................................... 5. “ We are having a wonderful time here, ” the tourists said.  ............................................................................................................................................... 6. “ My teacher wants to have a talk with you tomorrow morning, ” Tom said.  ............................................................................................................................................... 7. “ I am visiting the museum tomorrow, ” said Tom.  ............................................................................................................................................... 8. He said to me, “ I have something to show to you. ”  ............................................................................................................................................... 9. “ We’ll wait until he comes back, ” they said.  ............................................................................................................................................... 10. He said to me, “ You can keep this one if you like. ”  ............................................................................................................................................... 11. Paulo said , “I want to buy a gift for my father .”  ............................................................................................................................................... 12. “The store isn’t going to open on New Year’s Day” The man informed us.  ............................................................................................................................................... 13. She said, “I spent a summer here in this village.”  ............................................................................................................................................... 14. The students said, “We’ll be sitting for our exams next Monday” .  ............................................................................................................................................... 15. The nurse said , “The patient in this room did not obey your orders ,Doctor.”  ............................................................................................................................................... 16. “The house will seem so empty without you and Tim” Mr. Brown said to Susan  ............................................................................................................................................... 17. “If she knew the truth, she would be happy.” David told me .  ............................................................................................................................................... 18. The manager said, “John! You must finish the work by 5 o’clock”  ............................................................................................................................................... 19. Our teacher said: “ The Second World War broke out in 1939.”  ............................................................................................................................................... 20. Mother said, “I think it won’t rain tomorrow.”  ............................................................................................................................................

các anh chị cho em hỏi vì sao f'(x) >= (PARAPOL) => g(x)' > 0 vậy ạ ? f(x)' vẫn có thể âm mà

Chất X là axit cacboxylic đơn chức, mạch hở; chất Y là amino axit có công thức H2NCnH2nCOOH. Cho hỗn hợp E gồm X và peptit Y–Ala–Y tác dụng vừa đủ với 450 ml dung dịch NaOH 0,1M, thu được hỗn hợp muối Z. Đốt cháy hoàn toàn Z thì thu được N2, Na2CO3 và 2,408 lít khí CO2 và 1,935 gam H2O. Phần trăm khối lượng của X có trong E là A. 38,86%. B. 25,90%. C. 22,02%. D. 32,53%

Các bạn làm giúp mình với chỉ key word nữa nhé🥰🥰🥰