Lời giải :
`\sqrt{x^2+1}` luôn xác định vì Ta có: `x^2>=0forall x``=>x^2+1>=1>0 forall x``=>` Biểu thức luôn xác định với mọi `x`
`\sqrt{x^2+1}`
`x^2+1>=0`(luôn đúng)
`->x∈Z`
Giúp mk nhanh vs ạ mk cần gấp lắm Điền từ
EXERCISE 1. TWO OBJECTIVES. 1. The teacher bought each of us two English books. => Each of us…………………………………………………………………………… => Two exercise books ………………………………………………………………………… 2. They have sent enough money to those poor boys. => Enough money………………………………………………………………………… => Those poor boys………………………………………………………………………… 3. They have given the women in most countries in the world the right to vote. => The women in most countries in the world ……………………………………………… => The right to vote ………………………………………………………………………… 4. My mother has just made me a beautiful cake => I ………………………………………………………………………………………….. => A beautiful cake…………………………………………………………………………… EXERCISE 2. SPECIAL CASES 1. They think that he has died a natural death. => It…………………………………………………………………………………………………… => He…………………………………………………………………………………………………… 2. Some people believe that 13 is an unlucky number. => It…………………………………………………………………………………………………… => 13…………………………………………………………………………………………………… 3. They say that John is the brightest student in class. => It…………………………………………………………………………………………………… => John……………………………………………………………………………………………… 4. They reported that the President had suffered a heart attack. => It…………………………………………………………………………………………………… => The President …………………………………………………………………………………… 5. I knew that they had told him of the meeting. => It…………………………………………………………………………………………………… => They……………………………………………………………………………………………… 6. They declared that she won the competition. => It…………………………………………………………………………………………………… => She………………………………………………………………………………………………… 7. They rumored / romoured (đồn đại) that the man was still living. => It…………………………………………………………………………………………………… => The man………………………………………………………………………………………… 8. People believed that the earth stood still. => It…………………………………………………………………………………………………… => The earth………………………………………………………………………………………… 9.People son't make the children work hard. => The children ……………………………………………………………. 10. I have heard her sing this song several times. => This song ……………………………………………………………….. 11. They think that he has died a natural death.... => It's ……………………………………………………………………….. => He…………………………………………………………………………. 12. He won't let you do that silly thing again. => You ………………………………………………………………………. 13. People saw him steal your car. => He …………………………………………………………………………. 14. She is having her uncle fix the fan. => She is having _________________________________ 15. I had someone break into my flat yesterday. => I had ______________________________ 16. We will have some painters paint the wall. => We will have _________________________________ 17. They have the laundry keep all their clothes. => They have _________________________________ 18. Nothing will affect the result of the competition. => The result of the competition _________________________________ 19. No one has found the missing boy. => The missing boy _________________________________ 20. Nobody protects the tower well. => The tower _________________________________ EXERCISE 3. Give the correct form of the verb. 1. Toshico had her car (repair) by a mechanic. …………………………………………………………………………………………………… 2. Ellen got Marvin (type) her paper. …………………………………………………………………………………………………… 3. We got our house (paint) last week. …………………………………………………………………………………………………… 4. Dr Byrd is having the students (write) a composition. …………………………………………………………………………………………………… 5. Mark got his transcripts (send) to the university. …………………………………………………………………………………………………… 6. Maria is having her hair (cut) tomorrow. …………………………………………………………………………………………………… 7. Will Mr. Brown have the porter (carry) his luggage to his car? ……………………………………………………………………………………………………
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