Nghiệm tầm thường là gì vậy ạ ;-;?

a tổng của hai số là 80 tỉ số của hai số đó bằng 0,28 tìm hai số đó b mua ba cây bút bi và bốn cây bút chì hết 15900₫ Nếu mua năm cây bút bi cùng loại và 6 cây bút chì cùng ngoại thì hết 25100₫ Tìm giá mỗi cây bút bi và giá mỗi cây bút chì

Một ô tô đi với vận tốc 51 km/giờ. Hỏi ô tô đó đi với vận tốc bao nhiêu m/phút ? A. 850m/phút B. 805m/phút C. 510m/phút D. 5100m/phút

A. Teenagers in Botswana and in New York do not share the same interests B. It has been proved that people from different cultures think in the same way C. The concept of all people thinking the same is disputed by a researcher D. Logic reasoning is of little importance when it comes to shaping people’s thoughts Question 42. Which of the following can be inferred from the passage? A. Soviet psychologists tried to make radical changes to pragmatic circumstances. B. The way our brain processes information is kept unchanged. C. We will have the same habits of thoughts when we immerse ourselves in another culture. D. In-depth research is needed to shed light on the relationship between culture and thinking Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Question 43. Success in the World Memory Championships involves memorizing large numbers of cards in the correct consequence, as well as numbers containing up to 2,000 digits. A. memorizing B. consequence C. containing D. digits Question 44. The injured bird started to flaptheir wings, and finally managed to fly away. A. injured B. flap C. their D. managed Question 45. Last month, cycling safety groups are planning to lobby for better facilities for cyclists. A. are B. to lobby C. facilities D. cyclists Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions. Question 46. It was wrong of you to copy all her writing paper. A. You shouldn’t have copied all her writing paper. B. You can’t have copied all her writing paper. C. You needn’t have copied all her writing paper. D. You might not have copied all her writing paper. Question 47. “No, I won’t take part in the contest,” said Sally. A. Sally promised to take part in the contest. B. Sally apologized for not taking part in the contest. C. Sally regretted not taking part in the contest. D. Sally refused to take part in the contest. Question 48. My friend has stopped using social media. A. My friend sometimes uses social media B. My friend doesn’t like using social media C. My friend doesn’t use social media any more D. My friend has never used social media. Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. Question 49. You can take my favourite book. Make sure you bring it back by tomorrow. A. If only you took my favourite book and brought it back by tomorrow. B. Unless you take my favourite book, you will bring it back by tomorrow. C. You can take my favourite book so long as you bring it back by tomorrow. D. I wish you had taken my favourite book and brought it back by tomorrow. Question 50. She read all the instructions of the exam. She started to do it. A. Not until she started to do the exam did she read all of its instructions. B. Only after reading all the instructions of the exam did she start to do it. C. Hardly did she read all the instructions of the exam when she started to do it. D. Only by reading all the instructions of the exam did she start to do it.

các bạn thân yêu giúp mik với đc ko

'Trăng ơi... từ đâu đến? Hay từ một sân chơi Trăng bay như quả bóng Bạn nào đá lên trời' Đoạn thơ trên sử dụng biện pháp nghệ thuật nào? b. Trình bày cảm nhận của em về hình ảnh trăng qua đoạn thơ trên.

cho pt 5x2 -7x + 1 = 0. có 2 nghiệm x1; x2, Tính giá trị biểu thức A = ( x1 - 7/5)x1 + 1/25x2^2 + x2^2

Both sentences in each pair have the same meaning.. Complêt the second sentences. 1. The invention of the computer simplified the work accountants. ->Since the computer_____ the work of accountants_____ simplified. 2. I'd like out some travel insurance if I were you, Mr.Smith. -> Mr. Smith_____take out some travel insurance. 3. Someone used a knife to open this window. -> this window ___ a knife. 4. You will hear from us when we hve finished dealing with your complait. -> After your complait____, you will hear from us. 5. An announcement of their angagement appeared in the local paper. -> Their angagement___in the local paper. 6. Nobody ever heard anything of David again. -> Nothing____ David again.

Tam giác ABC nhọn, các đường cao AD, BE, CF cắt nhau tại H. Lấy K sao cho KH vuông góc BE, và góc BKE = 90, Lấy I sao cho IH vuông góc CF, và góc CIF= 90. Biết HF. HC= HE . HB C/m BK, CI, BC là độ dài 3 cạnh tam giác vuông.

1. Tìm điều kiện để biểu thức sau đây xác định: √a^2-4a+4 2. Rút gọn biểu thức sau: A= √a^2+2a+1 ___________ |a|-1