Mấy anh chị giúp e câu này với. Em cám ơn nhiều ạ 
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Anh chị giúp e giải câu này với ạ! Em cảm ơn rất nhiều ạ<3
\(d,=\dfrac{3y}{5x\left(x-y\right)}\\ e,=\dfrac{5x\left(x+2\right)\left(2-x\right)}{4\left(x-2\right)\left(x+2\right)}=\dfrac{-5x}{4}\\ f,=\dfrac{3\left(x-6\right)\left(x+6\right)}{2\left(x+5\right)\left(6-x\right)}=\dfrac{-3\left(x+6\right)}{2\left(x+5\right)}\\ g,=\dfrac{3xy\left(x-3y\right)\left(x+3y\right)}{2x^2y^2\left(x-3y\right)}=\dfrac{3\left(x+3y\right)}{2xy}\\ h,=\dfrac{45x^2y\left(x-y\right)\left(x+y\right)}{10xy\left(y-x\right)}=\dfrac{-9x\left(x+y\right)}{2}\\ i,=\dfrac{12\left(a-b\right)\left(a+b\right)\left(a^2+ab+b^2\right)}{3\left(a+b\right)\left(a-b\right)^2}=\dfrac{4\left(a^2+ab+b^2\right)}{a-b}\)
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e: \(=\dfrac{5\left(x+2\right)}{4\left(x-2\right)}\cdot\dfrac{-2\left(x-2\right)}{x+2}=\dfrac{-10}{4}=-\dfrac{5}{2}\)
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Giúp em thêm bài này nữa nha mấy anh chị em cám ơn rất nhiều
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
PTHH: 2R + 2nHCl → 2RCln + nH2
Mol: \(\dfrac{0,3}{n}\) 0,15
\(M_R=\dfrac{3,6}{\dfrac{0,3}{n}}=12n\left(g/mol\right)\)
Vì R là kim loại nên có hóa trị l,ll,lll
| n | l | ll | lll |
| MR | 12 | 24 | 36 |
| Kêt luận | loại | thỏa mãn | loại |
⇒ R là magie (Mg)
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ANH CHỊ GIÚP E 3 CÂU AV 7 NÀY VỚI Ạ .CHIỀU EM KIỂM TRA RỒI.EM CẢM ƠN RẤT NHIỀU Ạ
3. I think collecting stamps is interesting
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Anh chị ui giúp e làm bài này với ạ! E đg cần gắp lắm ý:(( Em cảm ơn anh chị nhiều ạ<3
Anh chị ơi giúp em làm bài này với ạ! E đg cần gấp lắm luôn ý:(( E cảm ơn anh chị nhiều ạ<3
\(a,=x^2+x+4x+4=\left(x+1\right)\left(x+4\right)\\ b,=x^2+2x-3x-6=\left(x-3\right)\left(x+2\right)\\ c,=x^2-2x-3x+6=\left(x-2\right)\left(x-3\right)\\ d,=3\left(x^2-2x+5x-10\right)=3\left(x-2\right)\left(x+5\right)\\ e,=-3x^2+6x-x+2=\left(x-2\right)\left(1-3x\right)\\ f,=x^2-x-6x+6=\left(x-1\right)\left(x-6\right)\\ h,=4\left(x^2-3x-6x+18\right)=4\left(x-3\right)\left(x-6\right)\\ i,=3\left(3x^2-3x-8x+5\right)=3\left(x-1\right)\left(3x-8\right)\\ k,=-\left(2x^2+x+4x+2\right)=-\left(2x+1\right)\left(x+2\right)\\ l,=x^2-2xy-5xy+10y^2=\left(x-2y\right)\left(x-5y\right)\\ m,=x^2-xy-2xy+2y^2=\left(x-y\right)\left(x-2y\right)\\ n,=x^2+xy-3xy-3y^2=\left(x+y\right)\left(x-3y\right)\)
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Bào quan riboxom trong chất tế bào có chức năng gì?
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a) \(=\left(x^2+x\right)+\left(4x+4\right)=x\left(x+1\right)+4\left(x+1\right)=\left(x+1\right)\left(x+4\right)\)
b) \(=\left(x^2+2x\right)-\left(3x+6\right)=x\left(x+2\right)-3\left(x+2\right)=\left(x+2\right)\left(x-3\right)\)
c) \(=\left(x^2-2x\right)-\left(3x-6\right)=x\left(x-2\right)-3\left(x-2\right)=\left(x-2\right)\left(x-3\right)\)
d) \(3x^2+9x-30=3\left(x^2+3x-10\right)=3\left[\left(x^2+5x\right)-\left(2x+10\right)\right]=3\left[x\left(x+5\right)-2\left(x+5\right)\right]=3\left(x-2\right)\left(x+5\right)\)
e) \(=-\left(3x^2-5x-2\right)=-\left[\left(3x^2-6x\right)+\left(x-2\right)\right]=-\left[3x\left(x-2\right)+\left(x-2\right)\right]=-\left(3x+1\right)\left(x-2\right)\)
f) \(x^2-7x+6=\left(x^2-x\right)-\left(6x-6\right)=x\left(x-1\right)-6\left(x-1\right)=\left(x-1\right)\left(x-6\right)\)
h) \(=4\left(x^2-9x+14\right)=4\left[\left(x^2-7x\right)-\left(2x-14\right)\right]=4\left[x\left(x-7\right)-2\left(x-7\right)\right]=4\left(x-2\right)\left(x-7\right)\)
i) \(=3\left(3x^2-8x+5\right)=3\left[\left(3x^2-3x\right)-\left(5x-5\right)\right]=3\left[3x\left(x-1\right)-5\left(x-1\right)\right]=3\left(x-1\right)\left(3x-5\right)\)
k) \(=-\left(2x^2+5x+2\right)=-\left[\left(2x^2+4x\right)+\left(x+2\right)\right]=-\left[2x\left(x+2\right)+\left(x+2\right)\right]=-\left(x+2\right)\left(2x+1\right)\)
l) \(=\left(x^2-5xy\right)-\left(2xy-10y^2\right)=x\left(x-5y\right)-2y\left(x-5y\right)=\left(x-5y\right)\left(x-2y\right)\)
m) \(=\left(x^2-2xy\right)-\left(xy-2y^2\right)=x\left(x-2y\right)-y\left(x-2y\right)=\left(x-2y\right)\left(x-y\right)\)
n) \(=\left(x^2-3xy\right)+\left(xy-3y^2\right)=x\left(x-3y\right)+y\left(x-3y\right)=\left(x+y\right)\left(x-3y\right)\)
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Dạ Anh/Chị trong group giải giúp em câu này với ạ. Em cám ơn nhiều. I. Use the correct form of the word given in each sentence:1. Like beverage cans and bottles, this _______________ can be recycled. (produce)2. The next stage in the _______________ of television is interactive TV. (develop)3. You’d better put an _______________ in the local paper to sell your house. (advertise)4. I enjoy the constant _______________ with students from other classes. (interact)5. ...
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Dạ Anh/Chị trong group giải giúp em câu này với ạ. Em cám ơn nhiều.
I. Use the correct form of the word given in each sentence:
1. Like beverage cans and bottles, this _______________ can be recycled. (produce)
2. The next stage in the _______________ of television is interactive TV. (develop)
3. You’d better put an _______________ in the local paper to sell your house. (advertise)
4. I enjoy the constant _______________ with students from other classes. (interact)
5. The Internet is a very useful means of _______________. (communicate)
6. There’s a lot of crime and _______________ on TV today. (violent)
7. Her novel is known to everyone. It is _______________ read. (wide)
8. Because Hoa lives in a remote area, the Internet isn’t _______________ for her. (availability)
9. My brother would like to be a _______________. (journal)
10. He was a town_______________ who had to stand in markets and public spaces, shouting the news to the residents of the town. (cry)
11. I find this newspaper _______________. I can get much useful knowledge from it. (inform)
12. Computers are becoming _______________ popular. They make everything faster and more reliable. (increase)
13. Watching TV has become one of the most popular forms of _______________. (entertain)
14. Nowadays, the Internet is _______________ used. We can see many products. (commerce)
15. _______________ is a film or radio or television program giving facts about something.(document)
16. The show brought _______________ to millions of viewers. (enjoy)
17. Although this laptop was a bit _______________, I still bought it yesterday. (cost)
18. There is a _______________ of local and international programs on TV. (vary)
19. I’m looking forward to seeing your _______________. (respond)
20. By learning English, we can understand more about the _______________ countries in the world. (develop)
21. It’s _______________to try to talk to her because she never listens. (use)
22. They walked _______________ to the room. (purpose)
23. Alexander G. Bell was one of the greatest _______________. (invent)
24. These mountain villages are completely _______________ in winter. (access)
25. I found the talk both informative and _______________. (entertain)
26. The Internet is becoming a _______________ tool for teachers. (use)
27. For most people a good _______________ helps them get a better job. (educate)
28. He was good at making up funny stories. He has an_______________ mind. (invent)
II. Rearrange the groups of words in a correct order to make complete sentences:
1. part of our everyday life / has increasingly / The internet / developed and become /. /
_______________________________________________________________
2. of using the computer, / can they? / can deny the advantages / No one/
_______________________________________________________________
3. uses the Internet / every day, / Your father / doesn’t he?
_______________________________________________________________
4. are used / with TV / Remote controls / to interact/./
_______________________________________________________________
5. news as / Town criers / they were walking / shouted the latest/./
__________________________________________________________________
6. is a very fast / The Internet / for me to get information/ and convenient way/./
__________________________________________________________________
7. most of the time / which website is useful / wandering because / I don’t know / I spend/. /
_______________________________________________________________
8. TV viewers / can watch a variety / on different channels / of local and international programs /./
_______________________________________________________________
9. My father / sports but / likes watching / my mother doesn’t/./
_______________________________________________________________
10. Most people / and magazines / love reading / newspapers/./
_______________________________________________________________
Anh chị giúp em câu này với, Toán lớp 9 .Em cảm ơn nhiều ạ
23.
\(\dfrac{a-\sqrt{a}}{1-\sqrt{a}}=\dfrac{-\sqrt{a}\left(1-\sqrt{a}\right)}{1-\sqrt{a}}=-\sqrt{a}\)
Đáp án C
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Anh chị giúp em câu này với, Toán lớp 9 .Em cảm ơn nhiều ạ
14.\(\dfrac{\sqrt{a^3}}{\sqrt{a}}=\dfrac{a\sqrt{a}}{\sqrt{a}}=a\)
4.\(-\dfrac{1}{3}ab^3\sqrt{\dfrac{9a^2}{b^2}}=-\dfrac{1}{3}ab^3.\dfrac{-3a}{b}=a^2b^2\)
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Anh chị giúp em câu này với, Toán lớp 9 .Em cảm ơn nhiều ạ
\(\sqrt{\dfrac{3a^6}{b^2}}=\dfrac{\sqrt{3a^6}}{\sqrt{b^2}}=\dfrac{\left|a^3\right|\sqrt{3}}{\left|b\right|}=\sqrt{3}a^2\left|\dfrac{a}{b}\right|\)
A
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