Giải hết giúp em đi mn :(
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NV
Nguyễn Việt Lâm
Giáo viên
8 tháng 12 2021
Mỗi câu hỏi có \(\dfrac{1}{4}\) khả năng trả lời đúng và \(\dfrac{3}{4}\) khả năng trả lời sai
Có 3 trường hợp thỏa mãn: học sinh trả lời đúng 7 câu, 8 câu, 9 câu
Xác suất:
\(P=C_9^7.\left(\dfrac{1}{4}\right)^7.\left(\dfrac{3}{4}\right)^2+C_9^8.\left(\dfrac{1}{4}\right)^8.\left(\dfrac{3}{4}\right)^1+C_9^9.\left(\dfrac{1}{4}\right)^9=\dfrac{11}{8192}\)
NM
6
27 tháng 6
1.I think you ought to give up playing video games. (should)
-->I think you should give up playing video games.
2.It's necessary for me to finish the work on time. (have to)
--->I have to finish the work on time.
3.It wasn't necessary for you to clean that car. (have to)
--->You didn't have to clean that car.
4.It was quite unnecessary for you to adopt a green lifestyle. (have to)
---->You didn't have to adopt a green lifestyle.
5.It was careless of you to leave the windows open last night. (shouldn't)
----->You shouldn't have left the windows open last night.
6.It is advisable for each member in the family to share the housework equally. (should)
---->Each member in the family should share the housework equally.
7.You are required to come back home before 10 p.m. (must)
--->You must come back home before 10 p.m.
8.Lina is advised to prepare carefully in the morning. (should)
----->Lina should prepare carefully in the morning.
9.Tu is responsible for picking up litter. (have to)
------>Tu has to pick up litter.
27 tháng 6
1.You are required to ask your parents for permission before staying out late. (must)
You must ask your parents for permission before staying out late.
2.I think you ought to give up smoking immediately. (should)
I think you should give up smoking immediately.
3.It is not a good idea for me to stay up late. (shouldn't)
I shouldn't stay up late.
4.It wasn't necessary for you to send these letters. (have to)
You didn't have to send these letters.
5.It was unnecessary for Tim to finish the work. (have to)
Tim didn't have to finish the work.
6.It was careless of you to leave your children alone at home. (shouldn't)
You shouldn't have left your children alone at home.
Bằng 1 cách nào đó 1 câu hỏi từ 2023 ở đây và tôi vẫn trả lời nó sau 1 năm :v
NC
7 tháng 5 2016
ANH CO DUOI KIP EM VA DUOI KIP O GIUA DUONH .CHAC CHAN DO TIN MINH DI
Câu 1: A. C2H6, C4H10, C2H4
Câu 2: D. C2H4, CH4, C2H2, C6H6
Câu 3: C. 3 loại gồm: mạch thẳng, mạch nhánh và mạch vòng
Câu 4: B. liên kết 3. CTCT: \(HC\equiv CH\)
Câu 5: C. PE (polietilen)
PTHH: \(nCH_2=CH_2\xrightarrow[\text{trùng hợp}]{t^o,p,xt}\left(-CH_2-CH_2-\right)_n\)
Câu 6: B. CaCO3, CuO, NaOH
\(CaCO_3+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Ca+CO_2\uparrow+H_2O\\ CuO+2CH_3COOH\rightarrow\left(CH_3COO\right)_2Cu+H_2O\\ NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O\)
Câu 7: B. Axit hữu cơ với rượu
Câu 8: C. Có 40 ml rượu trong 100 ml dd rượu
Câu 9: A. 890 đvC
\(PTK_{\left(C_{17}H_{35}COO\right)_3C_3H_5}:\left(17.12+35+12+16+16\right).3+12.3+5=890A\left(đvC\right)\)
Câu 10: A.
\(\left(RCOO\right)_3C_3H_5+3H_2O\xrightarrow[axit]{t^o}3RCOOH+C_3H_5\left(OH\right)_3\)
Câu 11: C. cháy
\(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O \\ C_2H_4+3O_2\underrightarrow{t^o}2CO_2+2H_2O\)
Câu 12: D
\(CH_3COOH+K\rightarrow CH_3COOK+\dfrac{1}{2}H_2\uparrow\\ CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O\\ 2CH_3COOH+CaCO_3\rightarrow\left(CH_3COO\right)_2Ca+CO_2\uparrow+H_2O\\ 2CH_3COOH+CaO\rightarrow\left(CH_3COO\right)_2Ca+H_2O\)
Câu 13: D. Saccarozơ
Câu 14: D. có nhóm OH
CTCT: \(CH_3-CH_2-OH\)
1A
2D
3C
4B
5C
6B
7B
8B