Giải phương trình a. Cos2x - cosx = 0 b. √3sin2x + cos2x - 1 = 0

Giúp em vs ạ Làm mấy câu khoanh tròn á

Khẳng định nào đúng đáp án thôi cũng được

I'd hate.... The exams, so I'm doing my best.

Read the following passage and choose the best answer to each question The Peales were a distinguished family of America artists. Charles Wilson is best remembered for his portraits of leading figures of the American revolution. He painted portraits of Franklin and Jefferson, and over a dozen of George Washington. His life size portrait of his sons Raphaelle and Titian was so realistic that George Washington reportedly once tipped his hat to the figures in the picture. Charles Wilson Peale gave up painting in this middle age and devoted his life to the Peale, Museum which he founded in Philadelphia. The word's first popular museum of art and natural science, it featured paintings by Peale family as well as displays of animals in their natural settings. Peale found the animals himself and devised a 'method of taxidermy to make the exhibits more lifelike. The museum's most popular display was the skeleton of a mastodon -a huge, extinct elephant - which Peale unearthed on a New York farm in 1801. Three of Peale's seventeen children were also famous artists, Raphaelle Peale often painted still life of flowers, fruit, and cheese. His works show the same luminosity arid attention to detail that the works of the Dutch masters show. In the late eighteenth century, however, portraiture was the rage, and so Raphaelle Peale found few buyers for his still life at the time. His brother Rembrandt studied under his father and painted portraits of many noted people, including one of George Washington. Another brother, Rubens Peale, painted mostly landscapes and portraits. James Peale, the brother of Charles Wilson Peale, specialized in miniatures. His daughter Sarah Miriam Peale was probably the first professional female portrait painter in America. 56. The passage mainly discusses _________ A. The life of Charles Wilson Peale. B. Portraiture in the 18th century. C. The Peale Museum. D. A family of artists. 57. The author probably mentioned that Washington 'tipped his hat to the figures in the painting’ in paragraph 1 to indicate that _________ A. Charles Wilson Peale's painting was very lifelike. B. Washington respected Charles Wilson Peale's work. C. Washington was friendly with Raphaelle and Titian Peale. D. the painting of the two brothers was extremely large. 58. The word 'settings' in paragraph 2 is CLOSET in meaning to _______. A. environments B. categories C. positions D. requirements 59. For which of the following terms does the aurthor give a definition in the second paragraph? A. natural science B. skelton C. taxidermy D. mastodon 60. Which of the following questions about the Peale Museum does the passage NOT supply enough information to answer? A. Who found and prepared its animal exhibits? B. In what city was it located? C. Where did its most popular exhibit come from? D. In what year was it founded? 61. The word 'unearthed' in paragraph 2 is CLOSET in meaning to _______. A. displayed B. dug up C. located D. looked over 62. Which of the following words could be best replaced with the word 'rage' in paragraph 2? A. fashion B. anger C. conflict D. desire 63. According to the passage, Rembrandt Peale and his brother both painted_______. A. miniature B. portraits of George Washington C. paintings of flowers, fruit, and cheese D. pictures of animals 64. Which of the following words is NOT one of the children of Charles Wilson Peale? A. Titan Peale B. Rubens Peale C. Raphaelle Peale D. Sarah Miriam Peale 65. The author's attitude toward the Peales is generally____. A. envious B. ironic C. admiring D. disappointing

Lấy ví dụ về sự vận động và phát triển( môn chính trị)

xét tính chẵn lẻ f(x)=x^3-2x^2-x

So sánh Phong trào công nhân quốc tế cuối thể kỉ XIX, đầu thế kỉ XX với những cuộc cách mạng tư sản khác(của giai cấp nào, người lạnh đạo,...)?

trên đường đi học về Hiền thấy túi xách của ai đó đánh rơi . Nhìn xung quanh thấy không ai biết , Hiền nhặt lên và lấy hết số tiền trong đó còn túi thì bỏ lại chỗ cũ a. Em hãy nhận xét hành vi của bạn Hiền b. Nếu em là Hiền em sẽ làm gì

Tìm x,y,z biết : x/2=y/5;y/3=z/4 và x+y-z=-9