Tổng 4^4+44^44+444^444+4444^4444+2007 có là số chính phương hay ko ?

Một quả bóng có thể tích 2 lít ,chứa khí ở 27°C có áp suất 1 at ,người ta nung nóng quả bóng đến nhiệt độ 57°C đồng thời giảm thể tích xuống 1 lít .Hỏi áp suất lúc này là bao nhiêu.

IV. Rewrite the following sentences use ‘so/too’ or ‘either/neither’ as directed. (4 points) E.g. I like chocolate. (she) a. I like chocolate and she does, too. b. I like chocolate and so does she. I don’t like chocolate. (she) a. I don't like chocolate and she doesn’t, either. b. I don't like chocolate and neither does she. 1.I ate milk and bread for breakfast this morning. (my brother) 2.Minh wasn’t at home last night. (his parents) 3.Hoa can cook very well. (her sister) 4.She won't buy any eggs. (they) 5.Nga hates peas and carrots. (her aunt) V. Supply the antonyms of the words in brackets to complete each of the following sentences. (0.5 point) 1.Last year, Mr. Hoang drove very…………….. (CAREFULLY) 2.Lan always cycles……………………to school. (QUICKLY)

Mong mọi người giúp em vs ah ! Em đg cần gấp ạ !

Cho ` ΔABC` cân tại `A` , đường cao `AH` `(H ∈BC)` `a)` Chứng minh ` ΔAHB= ΔAHC` `b)` Gọi `D` là trung điểm của `HC` , qua `D` vẽ đường thẳng vuông góc với `BC` cắt cạnh `AC` tại `E` . Chứng minh ` ΔEHC` cân `c)` Chứng minh `E` là trung điểm `AC` `d)` Gọi `G` là trọng tâm ` ΔABC` . Chứng minh $BC+AG>4GE$

I. Choose the word that has the underlined part pronounced differently from the rest. (1) 1.A. allow B. follow C. blow D. know 2.A. pear B. wear C. pearl D. bear 3.A. danger B. behave C. basket D. baseball 4.A. soon B. room C. moon D. foot II. Choose the best answer. (3 points) 1.I’m not sure where Tom is. He _________ be in the school canteen. A. must B. should C. might D. can 2.- We don’t have a TV at our place. - _________? A. Why so B. Why not C. Why not so D. Why don’t you 3._________ did she go to the dentist last week? A. When B. What C. Why D. Who 4.They kept _________ touch _________ letters. A. in / by B. on / by C. in / with D. on / with 5.She sings _________ . A. beautiful B. nice C. beautifully D. lovely 6.You speak Japanese. _________. A. So do I. B. Either I can. C. So am I. D. Neither do I. 7.This food tastes _________. A. delicious B. careful C. deliciously D. carefully 8.Teenagers often like _________ the latest pop music. A. to listen B. listening to C. listen D. listening 9.- _________ to have dinner at my house ? - Yes. I’d love to. A. Do you like B. Would you like C. What about D. Let’s 10.Choose the word that has the same meaning as the underlined phrase. I’m not busy on Wednesday. A. tired B. late C. free D. hungry III. Supply the correct form of the verbs in brackets. (1.5 points) I (watch) ………..…Crime Reported on television last night and (enjoy) .it a lot. The first few scenes (be) ……...rather dull, but later the program (become) ….………very interesting. I also like the policeman on yesterday’s program because he talked about unusual crimes and he (explain) …………....everything very clearly. He also (give) ……………………. very good answers to all the questions.

Giải hộ mình ý 2 của câu b với ạ ( tính khoảng cách ......)

Huhu, làm gấp giúp em với ạ!! Giải thích giúp em luôn nha!!

I. Choose the word that has the underlined part pronounced differently from the rest. (1) 1.A. allow B. follow C. blow D. know 2.A. pear B. wear C. pearl D. bear 3.A. danger B. behave C. basket D. baseball 4.A. soon B. room C. moon D. foot II. Choose the best answer. (3 points) 1.I’m not sure where Tom is. He _________ be in the school canteen. A. must B. should C. might D. can 2.- We don’t have a TV at our place. - _________? A. Why so B. Why not C. Why not so D. Why don’t you 3._________ did she go to the dentist last week? A. When B. What C. Why D. Who 4.They kept _________ touch _________ letters. A. in / by B. on / by C. in / with D. on / with 5.She sings _________ . A. beautiful B. nice C. beautifully D. lovely 6.You speak Japanese. _________. A. So do I. B. Either I can. C. So am I. D. Neither do I. 7.This food tastes _________. A. delicious B. careful C. deliciously D. carefully 8.Teenagers often like _________ the latest pop music. A. to listen B. listening to C. listen D. listening 9.- _________ to have dinner at my house ? - Yes. I’d love to. A. Do you like B. Would you like C. What about D. Let’s 10.Choose the word that has the same meaning as the underlined phrase. I’m not busy on Wednesday. A. tired B. late C. free D. hungry III. Supply the correct form of the verbs in brackets. (1.5 points) I (watch) ………..…Crime Reported on television last night and (enjoy) .it a lot. The first few scenes (be) ……...rather dull, but later the program (become) ….………very interesting. I also like the policeman on yesterday’s program because he talked about unusual crimes and he (explain) …………....everything very clearly. He also (give) ……………………. very good answers to all the questions.

Cho mình hỏi làm sao ta biết được trong hệ thức vi-et x1=1?