Để `A \in Z`
`=> x +1 \vdots x -2`
`=> (x-2) + 3 \vdots x -2`
`=> 3 \vdots x-2` ( do `x -2 \vdots x -2` )
`=> x - 2 \in Ư(3) = {±1 ; ±3}`
`=> x \in {3; 1 ; 5 ; -1}`
Vậy `x \in {3; 1 ; 5 ; -1}`
Cách khác :
Ta có :
`A = {x+1}/{x-2} = {(x-2)+3}/{x-2} =1 + 3/{x-2}`
Để `A \in Z => 3/(x-2) \in ZZ` ( do `1 \in ZZ` )
`=>
`text{Đáp án + Giải thích các bước giải}`
`text{Ta có:}`
`A=(x+1)/(x-2)=(x-2+3)/(x-2)=(x-2)/(x-2)+3/(x-2)=1+3/(x-2)`
Để `A∈Z` thì:
`=>3 \vdots x-2`
`=>x-2∈Ư_(3)`
`=>x-2∈{1 ; -1 ; 3 ; -3}`
`=>x∈{3 ; 2 ; 5 ; -1}`
Vậy `x \in {-1 ; 2 ; 3 ; 5}`
Vì sao nói " sức lao động Mới chỉ là khả năng của lao động còn lao động là tiêu dùng sức lao động hiện thực
1. I am sorry that I didn’t finish my homework last night. => I regret................................................................................................................................. 2. Because they made too many mistakes, they failed in the exam. => If................................................................................................................................. => Had..................................................................................................................................... 3. Because he doesn’t leave immediately, I call a policeman. => Were.................................................................................................................................. 4. Today isn’t Sunday, so the pupils can’t go swimming. =>Were................................................................................................................................... 5. They cancelled all flights because of fog. => Had it.................................................................................................................................. 6. The meeting was put off because of pressure of time. => Had it................................................................................................................................. 7. The children couldn’t do swimming because the sea was too rough. => If................................................................................................................................. => Had the sea....................................................................................................................... => Had it.................................................................................................................................. 8. I’m sorry I missed your birthday party. => I wish.................................................................................................................................. => If only............................................................................................................................... 9. I would like the school holidays to be longer. => I wish the school............................................................................................................ => If only................................................................................................................................ 10. If I had been given fair warning, I would have avoided that date. => Had................................................................................................................................... 11. Please don’t say things like that. => I wish you............................................................................................................................. 12. It would have been a superb weekend if it hadn’t been for the weather. => But for................................................................................................................................... 13. It is a pity you didn’t tell us about this. => I wish...................................................................................................................................... 14. I haven’t much money, I can’t buy any new clothes. => If................................................................................................................................. => Were....................................................................................................................................... 15. I am sorry that I didn’t study French last year. => I wish...................................................................................................................................... 16. The weather forecast was inaccurate so we didn’t take the right precaution. => Had............................................................................................................................................ 17. The temparature didn’t fall below zero so the crops weren’t damaged. => Had............................................................................................................................................ 19. Mary didn’t work hard enough. She failed in the exam. => Had............................................................................................................................................. 20. He is sorry now that he didn’t invite Mary to his party. => If only........................................................................................................................................
mình đag cần rất rất gấp. mọi ng giúp mình vớiiii akkk. mình sẽ tick cho ai lm nhanh nhất và sẽ vote 5sao, ctrlhn
máu ở tĩnh mạch giàu oix hay nghèo oxi giải thích
CM nếu x^4-4x^3+5ax^2-4bx+c chia hết cho đa thức x^3+3x^2-9x-3 thì a+b+c=0 (làm theo cách đồng nhất hệ số) giúp mk với mk đang cần gấp...😰😰
giúp em bài 3 câu a,b với ạ ai nhanh em tick cho em cảm ơn
Giúp mình bài này với, nếu được thì ghi ra từ đó là adj, V, adv giúp mình luôn, mình cảm ơn
VII: Đặt câu hỏi cho phần gạch chân.
Giúp em với mọ người giải chi tiết nhé.
VII. Complete the questions, using the verbs from the box in the correct form. dogolisteneat 1. your father like rock music? 2. your parents like on holiday? 3. you enjoy ice-cream? 4. your friends hate their homework?
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến
