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6 tháng 11 2021
a. Ý nghĩa:
Hiệu điện thế định mức của bếp điện là 220V
Công suất định mức của bếp điện là 880W
Từ điện năng sang nhiệt năng.
b. \(Q=UIt=220\left(\dfrac{880}{220}\right).10.60=528000\left(J\right)=126110,64\left(Cal\right)\)
c. \(A=Pt=880.2.30=52800\)Wh = 52,8kWh
\(\Rightarrow T=A.1300=52,8.1300=68640\left(dong\right)\)
28 tháng 11 2021
\(b,\text{PT hoành độ giao điểm: }-x-7=-3x+1\Leftrightarrow x=4\Leftrightarrow y=-11\Leftrightarrow B\left(4;-11\right)\\ c,\text{Gọi }\left(D_3\right):y=ax+b\left(a\ne0\right)\\ \left(D_3\right)\text{//}\left(D_1\right)\Leftrightarrow a=-1;b\ne-7\Leftrightarrow\left(D_3\right):y=-x+b\\ \left(D_3\right)\cap\left(D_2\right)\text{tại điểm có tung độ }4\Leftrightarrow\left\{{}\begin{matrix}4=-3x+1\\4=-x+b\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-1\\b=3\end{matrix}\right.\\ \text{Vậy }\left(D_3\right):y=-x+3\)
\(d,\Leftrightarrow B\left(4;-11\right)\in\left(D_4\right)\\ \Leftrightarrow8m-4-5m-2=-11\\ \Leftrightarrow3m=-5\Leftrightarrow m=-\dfrac{5}{3}\\ e,\Leftrightarrow\left\{{}\begin{matrix}-x-7=0\\\left(2m-1\right)x-5m-2=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=-7\\7-14m-5m-2=0\end{matrix}\right.\\ \Leftrightarrow m=\dfrac{5}{19}\)
1 tháng 1 2022
I. Choose the word whose underlined part is pronounced differently from the others.
1. A. lantern B. invader C. nation D. race
2. A. tradition B. question C. procession D. preservation.
* Choose the word whose main stressed syllable is different from the rest.
3. A. confusion B. magician C. important D. otherwise
4. A. reunion B. bamboo C. festival D. display
II. Choose the best answer A, B, C or D to complete the sentence.
* Preposition:
5. How much time do you spend _______ leisure activities?
A. on B. in C. for D. with
6. Tran Temple Festival is held _______ the 15th day of the first lunar month.
A. in B. for C. at D. on
7. Our customs are passed __________ from generations to generations.
A. down B. up C. to D. over
*Form ( 3)
8. The costume of Thai is more ………..than that of the Hoa.
A. color B. colorful C. coloring D. colored
9. She listens to classical music for ______________.
A. relax B. relaxation C. relaxed D. relaxing
10. She was ______________ with her job and decided to look for a new one.
A. dissatisfied B. satisfy C. satisfied D. dissatisfy
Cái này phải là unsatisfied
Meaning (4)
11. ________ in terraced fields is the main economic activity of ethnic people in Sapa.
A. Fishing B. Rice cultivation C. Hunting D. Gathering
12. Ghe Ngo Race is a religious ritual of the Khmer to _______ the Snake God Nagar.
A. commemorate B. preserve C. command D. process
13. In the UK, families often celebrate Christmas together, _________ they can watch each other open their presents!
A. though B. but C. because D. so
14. It’s a custom in the USA as people use __________ in all meals.
A. cutleries B. offsprings C. belongings D. tips
Grammar (6)
15. The volunteers have to work much……..usual to save the dying animals from the forest fire.
A. as hard as B. more hard than C. harder than D. the hardest
16. You look really tired. You _________ take a few days off and have a holiday.
A. should B. must C. have to D. can
17. In the UK, there are lots of customs for table manners. For example, We ______ use a knife and fork at dinner.
A. have to B. are having C. has to D. having to
18. Does she fancy …………… a book to the younger children?
A. reads B. reading C. to read D. read
19. You _________ speak when the teacher is speaking.
A. needn’t B. can’t C. don’t have to D. mustn’t
20. We usually spend our holiday in the village _______ our grandparents live.
A.what B. where C. which D. when
Speaking (2)
21. ‘The film was very exciting, but the ending was unexpected.’
‘_______ I didn’t like its ending.’
A. It’s great! B. Spot on! C. Sounds bad! D. Hold on!
22. “My favourite leisure activity is people watching.” “_______”
A. That sounds so weird! B. That’s all right.
C. OK. That’s what you’ve chosen. D. Sure. It’s very entertaining
27. InA Vietnam the engagement isB sometimes considered muchC( more ) important thanD the wedding.
C. (much → more)
28. NomadicA children learn ridingB ( to ride) a horse whenC they are very smallD.
B. (riding\(\rightarrow\) to ride)
29. According forA(According ) tradition, the first person to enterB the house on New Year’s Eve bringsC either good luck orD bad luck.
A. (According for → According)
30. The Japanese areA familiar withB the western custom to eatC ( of eating ) a turkey dinner forD Christmas.
C. ( to eat → of eating)
Read the passage carefully, then choose the correct answers.
Tran Temple Festival, one of the largest annual spring festivals in Vietnam, is held on the 14th night and 15th day of the first lunar month at the national historical complex of the Tran Kings’ shrines and tombs in Tien Duc Commune, Hung Ha District, Nam Dinh City. It usually begins with an incense-offering rite at the kings’ tombs and a ritual for the opening of the gates of Den Thanh (Thanh Temple), Den Mau (Mother Temple) and the Tran Kings’ shrines. They are followed by a ‘water procession’, in which people will carry nine ornate palanquins with memorial plaques of the Kings of the Tran Dynasty and members of their royal families. A series of folk games are also organized during the festival, such as a rice-cooking challenge, clay firecrackers, chung cake wrapping and tug of war, alongside traditional performances and sport games including lion dances, dragon dances, cheo and chau van singing, human chess, wrestling and martial arts.
The Tran Temple Festival was recognized as a national intangible heritage in 2014. The historical complex of the Tran Kings’ shrines and tombs received special national relic status last year.
36. How often is the Tran Temple Festival held?
A. every month B. every year C. every two years D. twice a year
37. The Tran Temple Festival usually begins with ________.
A. formal ceremonies B. a water procession
C. prayers of thanks D. incense offerings to the gods
38. The word ‘they’ in the passage refers to ________.
A. temples B. offerings C. shrines D. rituals
39. Which of the followings is not organized in the festival?
A. rice cooking B. tug of war C. boat race D. human chess
40. Which of the followings is not mentioned in the text?
A.The Tran Dynasty is the most brilliant reign in Vietnamese history.
B.Tran Temple Festival was recognized as a national intangible heritage.
C. Nine ornate palanquins are carried in the water procession.
1 tháng 5 2019
mỗi người sau khi trả lời
nhìn hết câu trả lời bạn sẽ thấy chữ :'đúng' và chữ 'sai'
Nếu bạn thấy câu trả lời đúng thì bạn k đúng
@Như Ý
15 tháng 7 2021
a) Xét ΔOBH và ΔODA có
OB=OD(gt)
\(\widehat{BOH}=\widehat{DOA}\)(hai góc đối đỉnh)
OH=OA(O là trung điểm của HA)
Do đó: ΔOBH=ΔODA(c-g-c)
Suy ra: \(\widehat{OHB}=\widehat{OAD}\)(hai góc tương ứng)
mà \(\widehat{OHB}=90^0\)(gt)
nên \(\widehat{OAD}=90^0\)
hay AH\(\perp\)AD(đpcm)
b) Xét ΔAOE vuông tại A và ΔHOC vuông tại H có
OA=OH(O là trung điểm của AH)
\(\widehat{AOE}=\widehat{HOC}\)(hai góc đối đỉnh)
Do đó: ΔAOE=ΔHOC(Cạnh góc vuông-góc nhọn kề)
Suy ra: AE=HC(hai cạnh tương ứng)(1)
Ta có: ΔAOD=ΔHOB(cmt)
nên AD=HB(Hai cạnh tương ứng)(2)
Xét ΔAHB vuông tại H và ΔAHC vuông tại H có
AB=AC(ΔABC cân tại A)
AH chung
Do đó: ΔAHB=ΔAHC(Cạnh huyền-cạnh góc vuông)
Suy ra: HB=HC(Hai cạnh tương ứng)(3)
Từ (1), (2) và (3) suy ra AD=AE
mà E,A,D thẳng hàng(gt)
nên A là trung điểm của DE
PT
15 tháng 7 2021
) Xét ΔOBH và ΔODA có
OB=OD(gt)
ˆBOH=ˆDOABOH^=DOA^(hai góc đối đỉnh)
OH=OA(O là trung điểm của HA)
Do đó: ΔOBH=ΔODA(c-g-c)
Suy ra: ˆOHB=ˆOADOHB^=OAD^(hai góc tương ứng)
mà ˆOHB=900OHB^=900(gt)
nên ˆOAD=900OAD^=900
hay AH⊥⊥AD(đpcm)
b) Xét ΔAOE vuông tại A và ΔHOC vuông tại H có
OA=OH(O là trung điểm của AH)
ˆAOE=ˆHOCAOE^=HOC^(hai góc đối đỉnh)
Do đó: ΔAOE=ΔHOC(Cạnh góc vuông-góc nhọn kề)
Suy ra: AE=HC(hai cạnh tương ứng)(1)
Ta có: ΔAOD=ΔHOB(cmt)
nên AD=HB(Hai cạnh tương ứng)(2)
Xét ΔAHB vuông tại H và ΔAHC vuông tại H có
AB=AC(ΔABC cân tại A)
AH chung
Do đó: ΔAHB=ΔAHC(Cạnh huyền-cạnh góc vuông)
Suy ra: HB=HC(Hai cạnh tương ứng)(3)
Từ (1), (2) và (3) suy ra AD=AE
mà E,A,D thẳng hàng(gt)
nên A là trung điểm của DE