Cho a,b,c,d là các số thực. Chứng minh ($\frac{a+b+c+d}{4}$)^4 <= $\frac{a^4+b^4+c^4+d^4}{4}$

cứu câu 8

giúp mình bài 1 , 2 với ạ mình đang cần gấp lắm ạ

Traveling by tram is most convenient than traveling by car in this city xác định từ/ cụm từ gạch chân (a,b or c,d) cần sửa để trở thành từ chính xác những từ gạch chân: A.by tram B.most C. than D.by car

Tìm x, y ∈ Z, sao cho $\frac{1}{8}$ < $\frac{x}{12}$ < $\frac{y}{9}$ < $\frac{1}{4}$ 20 ĐIỂM

Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 14. “Good morning. Can I ask you some questions about this festival?” “___________” A: No, thanks. B: Yes, of course. C: That’s right. D: Never mind 12 Choose the best sentence which has a similar meaning to the given one. Question 22. Lang Lieu was very poor, so he couldn’t buy any special food. A: Lang Lieu couldn’t buy any special food because of be very poor. B: Lang Lieu couldn’t buy any special food because being poor. C: Lang Lieu couldn’t buy any special food because of he was very poor. D: Lang Lieu couldn’t buy any special food because he was very poor. 13 Choose the best answer A, B, C or D to complete the sentence. Question 9. This is the first time she _______ to the Hung King Temple festival. A: is B: was C: has been D: will be 14 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (18). Tet is a national and (17)______ festival in Vietnam. It is an occasion for every Vietnamese to be reunited to think (18)______ their past activities and hope for good luck in the year to come. Before Tet, all houses are white washed and (19)______ with yellow apricot flowers and colourful lanterns. Everybody is looking forward to a more favorable life. On the New Year’s Eve, children are smartly dressed. They are hoping to (20) ______ money put in small red envelopes as they are wishing longevity to their grandparents and parents. Wrong doings (21) ______ be absolutely avoided on these days. A: for B: after C: about D: to 15 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (20). Tet is a national and (17)______ festival in Vietnam. It is an occasion for every Vietnamese to be reunited to think (18)______ their past activities and hope for good luck in the year to come. Before Tet, all houses are white washed and (19)______ with yellow apricot flowers and colourful lanterns. Everybody is looking forward to a more favorable life. On the New Year’s Eve, children are smartly dressed. They are hoping to (20) ______ money put in small red envelopes as they are wishing longevity to their grandparents and parents. Wrong doings (21) ______ be absolutely avoided on these days. A: sell B: receive C: make D: buy 16 Choose the underlined part A, B, C or D that needs correcting. Picture 7 A: A B: B C: C D: D 17 Choose the best answer A, B, C or D to complete the sentence. Question 10. The girl was crying when a fairy ________. A: appears B: appeared C: was appearing D: is appearing 18 Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits blank (19). Tet is a national and (17)______ festival in Vietnam. It is an occasion for every Vietnamese to be reunited to think (18)______ their past activities and hope for good luck in the year to come. Before Tet, all houses are white washed and (19)______ with yellow apricot flowers and colourful lanterns. Everybody is looking forward to a more favorable life. On the New Year’s Eve, children are smartly dressed. They are hoping to (20) ______ money put in small red envelopes as they are wishing longevity to their grandparents and parents. Wrong doings (21) ______ be absolutely avoided on these days. A: decorates B: decorating C: decorated D: decorate 19 Choose the correct sentences made from the given clues . Question 25. The tortoise / run / while / the hare / sleep. A: The tortoise was running while the hare was sleeping. B: The tortoise was running while the hare slept. C: The tortoise ran while the hare was sleeping. D: The tortoise ran while the hare slept.

Cảm nhận về hình tượng người lính trong bài thơ Đồng Chí của Chính Hữu. Từ đó so sánh vs vẻ đẹp của ng lính cách mạng trong bài thơ về tiểu đội xe ko kính của Phạm Tiến Duật

Độ tan của CuSO4 ở 85oC và 12oC lần lượt là 88,700g và 35,500g . Khi làm lạnh 1887,000 gam dd bão hòa CuSO4 từ 85oC xuống 12oC thì có bao nhiêu gam tinh thể CuSO4.5H2O tách ra khỏi dd ?

Cho (O) và A nằm ngoài (O).Từ A kar các tiếp tuyến AB,AC với (O).(B,C là các tiếp điểm).Dây BD của (O) // AC.E là giao điểm của AD với (O).I là trung điểm của BC.C/m B,E,I thẳng hàng

Hòa tan hoàn toàn 18,325 gam hỗn hợp X gồm kim loại R và oxit của nó vào nước, thu được 250ml dd chứa một chất tan có nồng độ 0,5M và khí H2 1,12 (l) (đktc). Xác định kim loại R?