Đáp án:
Giải thích các bước giải:
a) $\frac{x-2}{x+3}$ $\geq$ 0
<=> x - 2 $\geq$ 0
<=> x $\geq$ 2
Vậy tập nghiệm S = { x/x $\geq$ 2 }
b) $\frac{x-1}{x+2}$ $\leq$ 0
<=> x - 1 $\leq$ 0
<=> x $\leq$ 1
Vậy tập nghiệm S = { x/x $\leq$ 1 }
Giải hệ phương trình 2x^2 - 3xy + y^2 + x - y - 0 và x^2 + x + 1 = y^2 nhanh giúp mingf với
hai công nhân nếu làm chung thì trong 12 giờ sẽ hoàn thành xong một công việc . Họ làm chung với nhau trong 4 giờ thì người thứ nhất chuyển đi làm việc khác , người thứ 2 làm nốt công việc trong 10 giờ . Hỏi ng thứ hai làm một mình thì bao lâu hoàn thành xong công việc
Một tấm khăn trải bàn hình chữ nhật có chiều dài 5,2 m và chiều rộng bằng 3/5 chiều dài người ta trang trí giữa tấm khăn màu họa tiết hình thoi có kích thước bằng đường chéo thứ nhất là 1,2 m và đường chéo thứ hai 2,3 m hỏi sau khi trang trí tấm khăn thì diện tích Tấm khăn còn lại bao nhiêu mét vuông
mọi người ơi giúp em bài cuối của đề 15 đc ko ạ
An nghĩ ra 1 số,Bình nghĩ ra 1 số bằng 4/3 số của An,Cường nghĩ ra 1 số bằng 60% số của Bình.Hỏi số của Cường bằng bao nhiêu phần trăm số của An? giúp mình nha.mình đang cần gấp
trong bài " Tiếng rao đêm " chi tiết nào gây bất ngò cho nguoi đọc ? ...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Cho tam giác ABC vuông tại A. Gọi D và E lần lượt là các điểm trên cạnh AB và AC (D, E không trùng với đỉnh của tam giác). Chứng minh rằng: BE ²+CD ²=BC ²+DE ²
viết đoạn văn ngắn từ 7-10 câu trình bày cảm nghĩ của em về việc bảo vệ đất nước của dân tộc ta mọi người giúp em với ạ
giúp mình với ạ , mình cần gấpppp
Chọn câu trả lời tốt nhất cho những câu hỏi dưới đây Aaron's writing assignment was about an adventure. He made this chart to design his story. Use it to answer questions 1 and 2. Character Aaron (me) Tara (horse) Bram Chaxor Magus (wizard) Description brave, wise noble, black funny, rich evil, greedy, strong magical, honorable Problem must rescue friend must help Aaron wants Bram's money is asked to help Aaron Solution seek the great wizard take him places be rescued by Aaron catch him get him to help Câu 1: Which of these could Aaron use in the blank under Problem? A. good and evil B. has been captured C. adventure story D. will receive help Câu 2: This chart will help Aaron to — A. correct all of his mistakes B. understand what he reads C. plan what will happen in his story D. decide what kinds of stories he likes best Here is the first part of Aaron's rough draft. Use it to answer questions 3–5. (1) One day I woke up to some bad news. (2) My friend, Bram, had been captured by the evil Chaxor. (3) Bram was part of a nice family named the Drummonds. (4) They lived in a castle. (5) He was a regular ten-year-old kid. (6) He was a kind and friendly fellow. (7) He also liked to tell silly jokes. (8) It was horrible to think about how Bram could be trapped in Chaxor's dark cave. (9) I had to rescue my friend! (10) Something had to be done before it was too late! (11) Quickly I saddled up my noble black horse, Tara. (12) She was as fast as the wind. (13) Together we would help Bram. (14) I was deeply worried, though. (15) How could we face that evil being? (16) Chaxor had special abilities. (17) We did not have these abilities. (18) Tara was a horse with strength and courage, but she would not be successful alone. (19) I like sitting outside on warm spring nights in April. (20) As for me, I was just a young man. (21) However, I was brave and strong. Câu 3: Which of these sentences does not belong in this part of Aaron's story? A. 17 B. 18 C. 19 D. 20 Câu 4: How can sentences 6 and 7 best be joined without changing their meaning? A. He was a kind and friendly fellow also liked to tell silly jokes. B. A kind and friendly fellow also he liked to tell silly jokes. C. Was a kind and friendly fellow he also liked to tell silly jokes. D. He was a kind and friendly fellow who liked to tell silly jokes. Câu 5: Which sentence could best be added after sentence 21? A. My adventure story takes place in a land far away. B. Somehow I would find a way to defeat the evil Chaxor and free my friend. C. When I woke up, I was sad to hear the news of Bram's capture. D. Chaxor, who was an evil being, lived in a dark and ugly cave. Read this next section of Aaron's rough draft and answer questions 6–9. This section has groups of underlined words. The questions ask about these groups of underlined words. (22) There was only one person whose power was more stronger than Chaxor's. (23) This was the great wizard, Magus. (24) Magus had helped many people during his long life. (25) He was known by all in our land as being wise powerful, honorable, and fair. (26) There was only one problem. (27) Magus had been hiding from the rest of the world. (28) He lived on a mountaintop. (29) He had been betrayed by someone he trusted and had never left the mountaintop since that time. (30) I knew there was only one thing I could do. (31) Tara and I had to make a long journey. (32) We had to travel to Mount kiandra. (33) Could we get Magus to help us free Bram? (34) He was our only hope. (35) There was one thing I knew for certain. (36) Magus would never turn away someone in need. Câu 6: In sentence 25, wise powerful, honorable, should be written — A. wise, powerful, honorable, B. wise powerful honorable C. wise, powerful honorable D. as it is Câu 7: In sentence 22, was more stronger should be written — A. were stronger B. was more strong C. was stronger D. as it is Câu 8: In sentence 24, people during should be written — A. peeple during B. people durring C. peopel during D. as it is Câu 9: In sentence 31, Tara and I had to should be written — A. Tara and me had to B. I and Tara had to C. Tara and I has to D. as it is Câu 10: In sentence 32, travel to Mount kiandra should be written — A. travle to Mount kiandra B. travvel to mount Kiandra C. travel to Mount Kiandra D. as it is
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến