Đáp án + Giải thích các bước giải:
`(2x-3)(5+x)-(x-2)(2x+1)=3`
`=> 2x^2 + 7x - 15 - 2x^2 + 3x + 2 = 3`
`=> (2x^2-2x^2) + (7x+3x) - (15-2) = 3`
`=> 10x - 13 = 3`
`=> 10x = 16`
`=> x = 8/5`
Vậy `S = {8/5}`
` (2x-3)(5+x) - (x-2)(2x+1) = 3`
`<=> 10x + 2x^2 - 15 - 3x - 2x^2 - x + 4x + 2 = 3`
`<=> 10x - 13 = 3`
`<=> 10x = 16`
`<=> 5x = 8`
`<=> x = 8/5`
5. Choose the right forms in these sentences. In some cases both forms are right. 1. Is your house much further/ farther? 2. Who is the oldest/ eldest in this class? 3. Your driving is worse/ worst than mine. 4. Have you heard the last/ latest news? 5. We have no further/ farther information. 6. His last/ latest words were: ‘The end’. 7. Trevor spends less/lesser on clothes than Laura does. 8. His English is gooder/ better than mine. 9. It’s the better/ best in the shop. 10. Jane is older/ elder than I am. 11. My elder/ older sister got married last year. 12. Emma made the least/ less mistake! 13. The Hotel Bristol has more/ most rooms. 14. I haven’t got many books. You’ve got more many/ more than I have. 15. Even if the worse/ worst happens, you shouldn’t give up hope.
Question IV. The passage below contains 7 mistakes. Recognize the mistakes and write their correct forms in your answer sheet. (7 pts) Almost children with healthy appetites are ready to eat anything that is to them and a child rarely dislikes food unless it is badly cooked. The way a meal is cooked and served is the most important and an served meal will often improve a child’s appetite. Never ask a child whether he likes or dislikes a food or never discuss likes or dislikes in front of him or never allow else to do so. If the father says he hates fat meat or the mother refuses vegetables within the child’s hearing, he is likely to copy this procedure. Take it for granted that he likes everything and he will. Nothing healthful should be omitted from the meal because of the dislike. At meal times, it is a good idea to a child a small portion and let him come back for a second helping ….
help me!!!,pleaseeeeeeeeeeeeeeeeeeeeeeeee
viết các tập hợp sau bằng cách chỉ ra tính đặc trưng cho các phần tử a={ 2,4,6,8,10,12} b={1,3,5,7,9,11,13,15} c={0,3,8,15,24,35,63} d={1/2,1/6,1/12,1/20,1/30}
Nhờ các bạn mấy câu làm rồi check xem có sai cho mình với còn mấy câu mình chưa làm đi nhờ các bạn giúp mình
Ai làm trong 6 phút em cho hay nhất
Put a question tag at the end of each statement 13) The Smiths need two cars,..............................? 14) You'd come if I needed help,..........................?
chứng minh nếu a thuộc N và (a,5)=1 thì a^100 -1 chia hết cho 125.Làm nhanh trong vòng 10 phút tới xong thì cho 5* vs ctlhn
Tìm nghiệm của phương trình trên khoảng đã cho: sin(x+π/6)=1/2 với xϵ(-π/2;2π/3) Mong mọi người giúp ạ
Cho a+b+c+2=abc Tìm Min R=$\frac{a+3}{\sqrt[]{6a^{2}+12}}$ +$\frac{b+3}{\sqrt[]{6b^{2}+12}}$+$\frac{c+3}{\sqrt[]{6c^{2}+12}}$
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