Đáp án: `S={9;-25}`
Giải thích:
`x²+16x=225`
`⇔x²+16x-225`
`⇔x²-9x+25x-225=0`
`⇔x(x-9)+25(x-9)=0`
`⇔(x+25).(x-9)=0`
`⇔\(\left[ \begin{array}{l}x=9\\x=-25\end{array} \right.\)`
Vậy phương trình có tập nghiệm `S={9;-25}`
`x^2+16x=225`
`<=>x²+16x-225=0`
`<=> x²-9x+25x-225=0`
`<=> x(x-9)+25(x-9)`
`<=>(x-9)(x+25)=0`
\(\left[ \begin{array}{l}x-9=0\\x+25=0\end{array} \right.\) `<=>`\(\left[ \begin{array}{l}x=9\\x=-25\end{array} \right.\)
vậy `S={9;-25}`
Kể về một việc tốt mà em đã làm (nhặt được ví) mk cần mở bài và kết bài
Part 2 ...............................
12 Peter, Would you mind collecting my things from dry cleaners? Ticket is on hall table. Thanks. Emma A. Emma wants Peter to give her a lift to the dry cleaners B.Emma wants Peter to bring her clothes home. C. Emma has forgotten her ticket and wants Peter to collect it for her. 13. A. The Barton College team will visit the gym later today B. The basketball team only wants to see C. There are not enough team members available on Friday. experienced players. PLAYERS WANTED For Friday's basketball match against Barton College- can YOU help the team? Come to the gym at 3 p.m today, whatever your level. 14 Francesco! Problem- Maria's borrowed my history textbook and she's away.Could you lend me yours? Leave it with Ken when you see him. Thanks, Natalie. Whose textbook does Natalie want to borrow? A. Ken's B. Francesco's C. Maria's 15. CITY BUSES Please have ready the exact fare for your journey A. All City Bus journeys cost exactly the same. B. You need to have the correct money when you board the bus. C. You must keep your ticket ready for checking. The Namibia Challenge in Africa The Namibia Challenge is a seven-day race organized by Raleigh International, a company established in 1985. want to learm teamwork and communication skills. It It is a competition for people (16)... (17).. -place in the Namib desert in Africa, where team spends a week pushing themselves to their limit and (18).. .........useful skills. As a final challenge, participants (19)................to climb Mount Branberg, Namibia's highest mountain. Paul Webster, a university student, is willing to (20). ...his experiences with other students. "The Namibia Challenge is especially useful if, (21)... .me, you haven't had (22)... .experience of working in a team,' he says. "(23).... the end of it, we were all trying to help each other in the tean It's also a great opportunity to (24).. ...people of many different nationalities in a very speci environment. I'm (25). .of working back to Namibia if I can." 16. A. what B. which C. who D. whose 17. A takes b gets c holds d has 18 A. following B. gets C. holds D. has B. developing C. growing D. becoming 19. A smay B. got C. have D. must 20. A. inform B. let C. talk D. share C. for D. like D. few 21. A. against B. except 22. A much B. lot C. many 23. A. In B. By C. Since D. From 24, A. introduce B. meet C. know D. greet 25. A. thinking B. planning C. deciding D. considering
Cho đường thẳng (d): y=3x-5 và (p): y=2x^2 a) Vẽ đồ thị của (d) và (p) trên cùng 1 mặt phẳng tọa độ b) Tìm giao điểm của 2 đồ thị trên
Nhờ mng giúp em với ạ em đang cần gấp
Mọi người kiểm tra đáp án xem coi mình làm đúng không nha
giúp mik với, hứa sẽ cho ctlhn và 5*
7. He is very thin perhaps that’s why he feels very cool. …………………………………………………………….. 8. I’m fat, that’s why can’t get through the bathroom’s window. ……………………………………………………………….. 9. He doesn’t help me, possible because I never ask him for help ………………………………………………………………….. 10. I can’t drive so we can’t take the car. ………………………………………..
II. Rewrite each of the following sentences in such a way that it means exactly the same as the sentence printer before it. Use the words given and do not change their form. (10points) 1. " You shouldn't lend him any more", Mrs Chi said. advised 2. The bread is so stale that we can't eat it. fresh 3. Whose handbag is this? belong 4. He last came back to his home village five months ago. for 5. My aunt managed a small business in the city but doesn't any more. used 6. Be sure to say goodbye to your grandmother before you leave. without 7. That sort of behavior is deplorable, in my opinion. approve 8. The new lecturer was unpopular with his students. tak 9. They’ll have to take the dog on holiday with them. behind 10. Women are not allowed to enter the inner temple. let
Tìm x Giúp mik vs Câu d) thui nha 😁
Loga.vn - Cộng Đồng Luyện Thi Trực Tuyến