x² - 3x + 1 tại x=2 

giúp mình với

. I. Combine two sentences into one, using “too, so, either, neither”: 1. He is hungry. I am hungry. => …………………………………………………………………………………………………………………….. 2. They can play volleyball. We can play volleyball. => …………………………………………………………………………………………………………………….. 3. I write diary every night. My sister writes diary every night. => …………………………………………………………………………………………………………………….. 4. Hoa ate bread and beef for breakfast. Her uncle ate bread and beef for breakfast. => …………………………………………………………………………………………………………………….. 5. Nam doesn’t like durian. Hoa doesn’t like durian. => …………………………………………………………………………………………………………………….. 6. Mr. Tam won’t come to the party tonight. His wife won’t come to the party tonight. => …………………………………………………………………………………………………………………….. 7. He didn’t meet her last night. I didn’t meet her last night. => …………………………………………………………………………………………………………………….. 8. They mustn’t stay up late. You mustn’t stay up late. => …………………………………………………………………………………………………………………….. 9. He drinks coffee in the morning. She drinks coffee in the morning => …………………………………………………………………………………………………………………….. 10. The boys played badminton. The girls played badminton => …………………………………………………………………………………………………………………….. 11. My father can't ride a bike. My mother can't ride a bike => ………………………………………………………………………………………………………………

Câu 1:          Nếu ta thắp một nắm hương để cho khói bay lên ở phía trước đèn pin, ta sẽ nhìn thấy một vệt sáng từ đèn phát ra xuyên qua khói. Giải thích vì sao? Biết rằng khói gôm các hạt nhỏ li ti bay lơ lửng. mọi người ơi giúp mình với. m cảm ơn