Hệ thức vi ét Cho phương trình x^2 +ax+ a-2 =0 Tìm a để x1^2- x2^2 =0

dãy tỉ số bằng nhau gồm 2 tính chất tính chất 1 là cộng tính chất 2 là trừ mình nói đúng không ạ xong mình vote 5 sao cảm ơn nhiều ạ giúp mình với

dãy tỉ số bằng nhau gồm 2 tính chất tính chất 1 là cộng tính chất 2 là trừ mình nói đúng không ạ xong mình vote 5 sao cảm ơn nhiều ạ giúp mình với

\(\huge{\huge{\mathbb{HELP!!}}}\) Tính giá trị của biểu thức: \(B=21(\sqrt{2+\sqrt{3}}+\sqrt{3-\sqrt{5}})^2-6(\sqrt{2-\sqrt{3}}+\sqrt{3+\sqrt{5}})^2-15\sqrt{5}\)

Cách giảm cận thị , Bạn cận mấy độ ? Câu ngoài lề : cho mik hỏi mấy cuốn sách hay tham khảo lớp 9 , tuyển sinh 10 tất cả các môn với ạ ghi tựa ra giúp mik nhé làm đầy đủ ctlhn !

Vẽ giùm avata mình nha vote 5* luôn (^_^)

P(x)=2x^3 -5x^2 +ax + b : x^2 - 4 ( a,b là tham số)

giúp mk 1 bài đọc hiểu + 1 bài viết vs Read the passage and choose the best answer to each question. (2p) Pets are kept by many people for pleasure or for pastime. They keep and nurse them at home as a hobby. Some people have special breeds of dogs or cats as pets while others rear birds in cages. In keeping pets we need to take special care. We have to feed them with the right food at proper times. Any failure on our part could endanger their life. We have to protect them from their enemies. Furthermore, the pets and their cages have to be kept clean. This is to prevent the attack of any diseases from unhygienic surroundings. If we understand their habits it is easy for us to handle them. Keeping pets gives us an opportunity to be kind to these creatures. We might learn more about the life and needs of pets. Those who keep birds like parrots are likely to read books about rearing them. Such people do not hesitate to spend money, time and energy for the well-being of their pets. 1.What is the main idea of the passage? A. Ways of feeding pets B. Keeping pets as a hobby C. Preventing attack of diseases D. Reading books about rearing birds 2. Which of the following is not true, accoring to the passage? A. Keeping dogs and cats as a hobby B. Feeding pets properly is important C. We should know about our pets’ life and needs D. If we fail to take car of pets, their life is dangerous 3. Our pets may get sick their surroundings are …………….. A. attacked B. prevented C. not clean D. not special Keeping pets is easy if we …………………. A. understand their habits C. read books about them B. give them an opportunity D. spend more money for them The word “rearing” in the passage is closest in meaning to……. A. giving food to C. looking for B. taking care of D. learning about VIII. Write a paragraph about the biography of Vivien Leigh- a famous actress. Base your biography on the following. (1p) Vivien Leigh (Vivian Mary Hartley) – born November 5th, 1913, India At age 3: first appeared on stage In 1931: first played in a British film The Village Squire, had different roles in many films after that. In 1939: became successful in Gone with the Wind and won Academy Award for Best Actress. Died July 7th, 1967- age 53 – London ………………………………………………………………………………………………… …………………………………………………………………………………………………………………….. ………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………………. ………………………………………………………………………………………………………………… ………………………………………………………………

Giúp mk c2 b vs bài 3 vs mn mk cần gấp ạ

Ông An gửi 20 triệu đồng vào ngân hàng A; sau 1 tháng, ông An nhận đc tiền lãi là 74000 đồng. Ông Bình gửi 25 triệu đồng vào ngân hàng B; sau 1 tháng, Ông Bình nhận đc tiền lãi là 95000 đồng. Hãy tính xem ngân hàng nào có lợi hơn cho khách hàng.