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chứng minh rằng hai số nguyên 2n và 12$n^{2}$ -6n+1 không đồng thời là số chính phương với n là số tự nhiên

Fill in each blank with the correct form of the verbs in brackets, using present simple and future simple. (Điền vào mỗi chỗ trống dạng đúng của động từ trong ngoặc, sử dụng thì hiện tại đơn và tương lai đơn.) It's wonderful to have a hobby to do for pleasure in your free time. My favourite hobby is gardening. I love watching flowers and eating vegetables, so I (1) (grow) a lot of plants in my garden. I usually (2) (water) them in the early mornings. Sometimes my mother also (3) (help) me care them and my father (4) (take) me to the market to buy seeds. I often (5) (read) books to understand more about gardening. This weekend I (6) (harvest) carrots and cabbages. Do you know how eager I am? I (7) (give) some of them to my grandparents. Also, I (8) (take) photos of them and post on Facebook. Let's wait and see!

Vẽ đậu mầm..........................

một người gửi ngân hàng 100 triệu trong 1 tháng lãi 1,5 triệu . Hỏi nếu gửi 14 tỉ trong 6 tháng lãi bao nhiêu ?

D. WRITING I. Mark the letter A, B, C or D on your answer sheet to indicate sentence that to each of the following questions. ((1.0 point) Question 41: I'm sorry can't go to your birthday party tomorrow. A. I wish I can go to your birthday party tomorrow. B. I wish I can't go to your birthday party tomorrow. C. I wish I could go to your birthday party tomorrow. D. I wish I couldn't go to your birthday party tomorrow. Question 42: "Why don't you meet to discuss how to organize the fair?" A. He suggested that we should meet to discuss how to organize the fair. B. He suggested that we shouldn't meet to discuss how to organize the fair. C. He suggested to meet to discuss how to organize the fair. D. He suggested to meeting to discuss how to organize the fair. Question 43: Nobody has invited me, so I'm not going to the party. A. Because haven't been invited, I'm going to the party. B. Because of haven't been invited, I'm not going to the party. C. Because I have been invited, I'm not going to the party. D. Because haven't been invited, I'm not going to the party. Question 44: Although it rained heavily, we all enjoyed the excursion. A. Despite it rained heavily, we all enjoyed the excursion. B. Despite the rain heavy, we all enjoyed the excursion. C. Despite the heavy rain, we all enjoyed the excursion. D. Despite the heavily rain, we all enjoyed the excursion. Question 45: Our school library contains over 50 thousand books. A. There is over 50 thousand books in our school library. B. There are over 50 thousand books in our school library. C. There have been over 50 thousand books in our school library. D. There has been over 50 thousand books in our school library. Question 46: We/ought/ submit/assignment/ tomorrow. A. We ought submit our assignment tomorrow. B. We ought to submit our assignment tomorrow. C. We ought to have submitted our assignment tomorrow. D. We ought have submitted our assignment tomorrow. Question 47: We hardly/ understand/ him/ because/ his accent. A. We hardly ever can understand him because of his accent. B. We may hardly understand him because his accent. C. We hardly understand him because he has his accent. D. We can hardly understand him because of his accent. Question 48: My children/look/summer holidays. A. My children are looking forward to the summer holidays. B. My children are looking to the summer holidays. C. My children are looking before the summer holidays. D. My children is looking forward to the summer holidays. Question 49: They / hard questions/ that/I/have/ no chance. A. They were quite hard questions that I had no chance. B. They were so hard questions that I had no chance. C. They were some hard questions that had no chance. D. They were such hard questions that I had no chance. Question 50: It/important / keep/ environment / clean A. It's very important keeping the environment clean. B. It's very important to keep the environment clean. C. It's very important to keep the environment to clean. D. It's very important to keep an environment clean.

Cho em hỏi bài nói với con liên hệ với bài nào được ạ???

Lấy 4,6g rượu etylic đem oxi hoá hữu hạn bằng oxi, có xúc tác thích hợp thu được 6,68g hỗn hợp sản phẩm. Cho hỗn hợp sản phẩm trung hoà vừa đủ bởi 100ml dung dịch NaOH 0,4M. Phần trăm rượu bị oxi hoá thành anđehit là: A. 50% B. 70% C. 80% D. 9%

xác định hóa trị n của nguyên tố Cl trong hợp chất HCl

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