Giúp em mấy câu với ạ. Bị độngaj. Gấp lắm ạ

tìm a,b,c 2a= 3b, 5b= 7c và 3a + 5b - 7c = 31

Câu 1: Dựa vào Át lát trang 9, 13, 14, Hãy trình bày và giải thích sự phân hóa lượng mưa ở nước ta? Câu 4: a, Sông ngòi nước ta phản ảnh rõ nét đặc điểm khí hậu nhiệt đới gió mùa ẩm. Dựa vào kiến thức đã học em hãy chứng minh cho đặc điểm trên. b, Phân tích ảnh hưởng của khí hậu đến sông ngòi nước ta. c, Tại sao nói "sông ngòi là hàm số của khí hậu trên một nền cảnh quan nhất định. Câu 1 với câu 4 gấp ạ

II. Choose a word in each line that has different stress pattern. 1. A. convenience B. resident C. vehicle D. skyscraper 2. A. metropolitan B. university C. organization D. multicultural 3. A. affordable B. environment C. variety D. indicator 4. A. development B. intelligence C. facility D. education 5. A. expensive B. fascinate C. restaurant D. difference

Câu 2: Cho phương trình: x² - 2mx - 1 = 0 với m là tham số. Không giải phương trình hãy chứng tỏ giá trị của biểu thức sau: A = $\frac{x²_{1} -1}{x_{1}}$ - $\frac{x²_{2} -1}{x_{2}}$ = 0 GIÚP MÌNH VỚI Ạ!!

use the correct passive tense of these verbs in brackets: 1.I....to the party last night but i didn't come(invite) 2Many accidents.....by reckless driving(cause) 3A new dormity....in the university campus now(build) 4thank goodness!My jewerly...in the robbery last night(not steal) 5.The electric light bulb....by Thomas Edison(invent) 6.Mickey Mouse cartoóns.........in sixty languages(translate) 7.If it is foggy,that sport event...........(cancel) 8.the examiner..........the result of the examination next week(tell) 9.This machine.........for quite a long time(not use) GIÚP ĐỠ MÌNH VỚI NHA.THANKS YOU NHÌU.

Giúp e với ạ , e hứa 5 sao và ctlhn ạ Chú ý : đoạn văn tự nghĩ ko chép mạng ( đoạn văn chứ ko phải bài văn ạ)

HOW TO KEEP A HEALTHY LIFE Health is imprtant to everyone. To keep fit and stay health, we should follow some simples tips. Firstly, we should do more exercise likes: riding a bike, running, swimming,jogging,... Secondly, we should it sensibly. We should ear more fruit and vegetables. We shouldn’t eat too much junk food beacause it makes you fast easily. Finally, we should get plenty of rest to avoid depression and concentrate at school and sleep more. In short, we should follow these tips beacause they are good for health. MN xem hộ mik bài này vs đk ạ. Mik vt đúng chx ạ?

HTHT and QKĐ 18She started learning English ten years ago. * A. She has not learnt English before. B. She has learnt English since ten years. C. She has started learning English for ten years. D. She has learnt English for ten years. 19“Why don’t you put a better lock on the door?" said John. * A. John suggested put a better lock on the door. B. John asked why not putting a better lock on the door. C. John suggested putting a better lock on the door. D. John made us put a better lock on the door. 20I haven’t eaten this kind of food before. * A. This is the first time I’ve eaten this kind of food. B. I haven’t eaten this kind of food already. C. This is the first kind of food I have eaten. D. Even before I have not eaten this kind of food. 21My brother and I go to that school * A. I went to that school and my brother, too B. I went to that school and so my brother did C. I went to that school and so did my brother D. I went to that school and so my brother did, too 22“Would you like to stay for dinner?” she asked me. * A. She asked me if I liked to stay for dinner. B. She invited me to stay for dinner. C. She offered me dinner. D. She was very kind to offer me dinner. 23“Would you like to come to my birthday party, Sarha?” asked Frederic. * A. Frederic invited Sarha to come to his birthday party. B. Frederic asked if Sarha was able to come to his birthday party. C. Frederic asked Sarha if she likes his brithday party or not. D. Frederic reminded Sarha of his coming birthday party. 24I have not met her for three years. * A. The last time I met her was three years ago. B. It is three years when I will meet her. C. I did not meet her three years D. During three years, I met her once. 25He started learning French six years ago. * A. He has learned French for six years. B. It was six years ago did he start learning French. C. He hasn’t learnt French for six years. D. It is six years since he has learnt French. 26He last had his eyes tested ten months ago. * A. He had tested his eyes ten months ago. B. He had not tested his eyes for ten months then. C. He hasn’t had his eyes tested for ten months. D. He didn’t have any test on his eyes in ten months

Cho a,b,c > 0 và a+2b+3c $\geq$ 20. Tìm GTNN của S= a+b+c+$\frac{3}{a}$ +$\frac{9}{2b}$ +$\frac{4}{c}$