Giúp mik với mn❤️❤️ Mik đang cần gấp

Vật sáng AB đặt vuông góc với trục chính của một thấu kính hội tụ,cách thấu kính 1 khoảng 20 cm cho ảnh thật A'B' có kích thước bằng 1/4 lần vật Tìm tiêu cự của thấu kính

Tìm một số tự nhiên có 4 chữ số, biết rằng nếu lấy số đó cộng với tổng các chữ số của nó thì đc 2000. mik sẽ tik cho bạn trả lời nhanh, đúng, có lời giải nha

Giải phương trình: $2x+3=x^2+(x-1)\sqrt[3]{3x^3+3}$

Giúp mình câu 49 nhé. Cảm ơn rất nhiều.

Giải thích ra giúp mình nha. Giúp mình vs ạ. Mình gấp lắm. Mình vote 5*

Một vật dao động điều hòa với biên độ 4 cm.tần số gốc là 10 rad/s .Tại thời điểm t=0 vật có li độ x =2cm .quãng đường lớn nhất mà vật đi được trong khoảng thời gian π/30s sau đó là

Giúp mik vs mik đag cần gấp Hứa vote 5* và hay nhất

mik sẽ tik cho bạn có lời giải, làm nhanh và đúng nha

II. Read the following text and answer the questions by choosing the option A, B, C or D. BENEFITS OF VIDEO CONFERENCING Video conferencing is the technology that allows you to hold meetings with people who are in different places while seeing them and talking to them in real time. It is different from simple video calling, which is often one-to-one video communication. In the past, video conferencing needed complex and expensive equipment. Today, it's easy to join in a video conference on your computer or smart phone with Internet connectivity. Moreover, video conferencing is also an important tool for people who work away from the office, often at home because it helps to save time and money for them. Video conferencing can help teachers in teaching, too. Video conferencing is a great way of learning and sharing knowledge beyond distance. Courses can take place with the teacher and each different student living in a different location. This will help education spread even to remote mountainous areas. 1. Video conferencing helps people _____________. A. send message B. send snail mail C. send snail mail D. hold meetings 2. How does video conferencing help people? A. It helps connect people in different places in real time. B. It helps connect people in different places in future time. C. It helps connect people in same places in real time. D. It helps connect people in same places in future time. 3. What can people do with video conferencing? A. People can see and touch each other. B. People can see and use telepathy. C. People can see and talk to each other. D. People can talk and touch each other. 4. Which statement below is NOT TRUE? A. Video calling is often one-to-one communication B. Video conferencing can happen between many people. C. In the past, video conferencing needed simple equipment. D. Today, video conferencing only needs smartphone with Internet connectivity. 5. How can video conferencing help people who work away from the office? A. It saves time. B. It saves money. C. It saves time and money. D. None of them. 6. Who will get benefits from video conferencing? A. farmer B. teacher C. engineer D. housewife 7. What is the advantage of studying through video conferencing? A. Teacher can start class late. B. Teacher doesn't know his/her students. C. Teacher and students can be in same places. D. Teacher and students can be in different places. 8. What does the word "mountainous" mean? A. a place has rivers B. a poor place C. a place has mountains D. a far place