Nhờ mọi người giúp đỡ ạ ;) , mình với thằng bạn ngồi 1 tiếng chưa ra :(
Cho a,b,c>0 thỏa a+b+c=3. Chứng minh rằng:
\(\dfrac{1}{6-ab}+\dfrac{1}{6-bc}+\dfrac{1}{6-ca}\le\dfrac{3}{5}\)
Bài toán liên quan đến đường trung bình của tam giác, xin nhờ mọi người giúp đỡ với ạ!
Nhờ mọi người giúp đỡ ಥ‿ಥ xin cảm ơn
Câu 1:
a) \(V_{Cl_2}=0,4.22,4=8,96\left(l\right)\)
b) \(n_{H_2}=\dfrac{1,2.10^{23}}{6.10^{23}}=0,2\left(mol\right)=>V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c) \(n_{CH_4}=\dfrac{4}{16}=0,25\left(mol\right)=>V_{CH_4}=0,25.22,4=5,6\left(l\right)\)
Câu 2
a) \(m_{Cu}=0,3.64=19,2\left(g\right)\)
b) \(m_{NaOH}=0,1.40=4\left(g\right)\)
c) \(n_{Zn}=\dfrac{1,5.10^{23}}{6.10^{23}}=0,25\left(mol\right)=>m_{Zn}=0,25.65=16,25\left(g\right)\)
d) \(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)=>n_{KOH}=0,1\left(mol\right)=>m_{KOH}=0,1.56=5,6\left(g\right)\)
Câu 3
a) \(n_{CuSO_4}=\dfrac{24}{160}=0,15\left(mol\right)\)
b) \(n_{NH_3}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
c) \(n_{Al}=\dfrac{1,8.10^{23}}{6.10^{23}}=0,3\left(mol\right)\)
Câu 1:
\(a,V_{Cl_2}=0,4.22,4=8,96(l)\\ b,n_{H_2}=\dfrac{1,2.10^{23}}{6.10^{23}}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\\ c,n_{CH_4}=\dfrac{4}{16}=0,25(mol)\\ \Rightarrow V_{CH_4}=0,25.22,4=5,6(l)\)
tìm số bé nhất sao cho khi viết số đó vào bên phải số 2009 thì được số có 6 chữ số chia hết cho 152
nhờ mọi người giúp đỡ ạ :) <3
Ta có 2009:152 =12 dư 33
Ta lại có 152 x 2=304
Do đó khi ta thêm 2 chữ số vào bên phải 2009 thì sau khi hạ chữ số hàng chục của số mới ta được 1
số lớn hơn 304 hơn 30
Vậy chữ số hàng đơn vị phải bằng 4
Số cần tìm là 44
44 nha bạn nguyen thanh tu
Dạ xin chào mọi người ạ! em có ít bài tập vì không kịp thời gian nên em lên đây xin nhờ mọi người giúp đỡ em hoàn thành 38 câu ạ
em cảm ơn.
I Use a Relative pronoun or relative adverb to combine each pair of sentences below.
1) The student is from Vietnam. She sits next to me.
2) I thanked the woman. This woman had helped me.
3) The professor is excellent. I’m taking his course.
4) The man is my father. I respect his opinions most.
5) She is the most intelligent woman. I have never met this woman.
6) Do you know the music ? It is being played on the radio.
7) I recently went back to Paris. It is still as beautiful as a pearl
8) That man is an artist. I don’t remember the man’s name.
9) That car belongs to Dr. Clark. Its engine is very good.
10) This is Mrs. Jones. Her son won the championship.
11) There is a No Parking sign. I don’t take notice of it.
12) His letter is full of interesting news. I received it two days ago.
13) The book is about Africa. It has some wonderful pictures.
14) My mother still goes in for sports. She is over 45.
15) The tables are old. They are in the living room.
16) The book was torn. I gave it to him.
17) Last month my father bought me a book. It was very expensive.
18) The knife was dull. She used it to cut bread.
19) Do you see these cars? They have just passed by.
20) Have you ever ridden the horse? She bought it in Tu Xuyen.
21) The computer was bought last month. It belonged to my sister.
22) The house was in bad condition. They built it three centuries ago.
23) The man gave me some screwdrivers(cái tua vít). They were not in good condition.
24) They showed me the photos. They took them during the trip in Japan.
25) Do you know the man? He is talking to the principal.
26) The man is standing in front of the house. He is complaining about the waste.
27) All the people have disliked him. I have never met them.
28) The book is new. I have just bought it.
29) Anybody may leave. They are tired.
30) The dictionary was given by my sister. She has just returned from England.
31) That is everything. She needs them for her camping trip.
32) There’s the man. His wallet was stolen.
33) There are a few things. We can do them.
34) I met the woman. Her husband is the president of the corporation.
35) I come from a country. Its history goes back thousands of years.
36) This is the pupil. You might want to make friends with him.
37) The professor is excellent. I am taking her course.
38) Mark Twain is an author. You like his books best.
1) The student is from Vietnam. She sits next to me.
->The student who sits next to me is from Vietnam
2) I thanked the woman. This woman had helped me.
->I thanked the woman who had helped me
3) The professor is excellent. I’m taking his course.
->The professor whose course I'm taking is excellent
4) The man is my father. I respect his opinions most.
->The man whose opinions I respect most is my father
5) She is the most intelligent woman. I have never met this woman.
->She is the most intelligent woman that I have ever met
6) Do you know the music ? It is being played on the radio.
->Do you know the music which is being played on the radio
7) I recently went back to Paris. It is still as beautiful as a pearl
->I recently went back to Paris which is still as beautiful as a pearl
8) That man is an artist. I don’t remember the man’s name.
->That man is an artist whose name I don't remember
9) That car belongs to Dr. Clark. Its engine is very good.
->That car whose engine is very good belongs to Dr. Clark
10) This is Mrs. Jones. Her son won the championship.
->This is Mrs. Jones whose son won the championship
11) There is a No Parking sign. I don’t take notice of it.
->There is a No Parking sign of which I don't take notice
12) His letter is full of interesting news. I received it two days ago.
->His letter which I received two days ago is full of interesting new
13) The book is about Africa. It has some wonderful pictures.
->The book which has some beautiful pictures is about Africa
14) My mother still goes in for sports. She is over 45.
->My mother who is over 45 still goes in for sports
15) The tables are old. They are in the living room.
->The tables which are in the living room are old
16) The book was torn. I gave it to him.
->The book which I gave to him was torn
17) Last month my father bought me a book. It was very expensive.
->Last month my father bought me a book which was very expensive
18) The knife was dull. She used it to cut bread.
->The knife which she used to cut bread was dull
19) Do you see these cars? They have just passed by.
=>Do you see these cars which have just passed by?
20) Have you ever ridden the horse? She bought it in Tu Xuyen.
->Have you ever ridden the horse which she bought in Tu Xuyen?
21) The computer was bought last month. It belonged to my sister.
->The computer which was bought last month belonged to my sister
22) The house was in bad condition. They built it three centuries ago.
The house which was built three centuries ago was in bad condition
23) The man gave me some screwdrivers(cái tua vít). They were not in good condition.
->The man gave me some screwdrivers that were not in good condition
24) They showed me the photos. They took them during the trip in Japan.
-> They showed me the photos which were taken by them during the trip in Japan
25) Do you know the man? He is talking to the principal.
->Do you know the man who is talking to the principal?
26) The man is standing in front of the house. He is complaining about the waste.
->The man who is standing in front of my house is complaining about the waste
27) All the people have disliked him. I have never met them.
->All the people whom I have never met have disliked him
28) The book is new. I have just bought it.
->The book which I have just bought is new
29) Anybody may leave. They are tired.
->Anybody who are tired may leave
30) The dictionary was given by my sister. She has just returned from England.
->The dictionary was given by my sister who has just returned from England
31) That is everything. She needs them for her camping trip.
->That is everything that she needs for her camping trip
32) There’s the man. His wallet was stolen.
->There's the man whose wallet was stolen
33) There are a few things. We can do them.
->There are a few things that we can do
34) I met the woman. Her husband is the president of the corporation.
-> I met the woman whose husband is the president of the corporation
35) I come from a country. Its history goes back thousands of years.
I come from a country whose history goes back thousands of years
36) This is the pupil. You might want to make friends with him.
->The is the pupil with whom you might want to make friends
37) The professor is excellent. I am taking her course.
->The professor whose course I am taking is excellent
38) Mark Twain is an author. You like his books best.
->Mark Twain is an author whose books you like best
không sao bạn ơi có sai mình cũng chấp nhận nha <3
Đề ?_?
@Cpr
#Forever
Mong bạn đưa câu hỏi đầy đủ trên phần TLCH để được trợ giúp nhé. Chứ bạn cũng không có đề đâu.
mọi người ơi cho em nhờ một chuyên có thể giải tiếng anh giúp bn này đc hông ạ với cả dạo này em thấy rất nhiều trường hợp lỗi ảnh ạ mong thầy cô và các anh cj cộng tác viên giúp đỡ để cộng đồng học 24 phát triển ạ em bt đây hông phải lỗi của thầy cô nhưng em mong thầy cô giúp đỡ bọn em píc cái lỗi này đc hông ạ em mong thầy cô giúp bọn em để cộng đồng học học 24 và các bn các anh cj coi học 24 như học ở trường ạ !!!!
Xin chào mọi người. Mình là thành viên mới nên nhờ mọi người giúp đỡ thêm cho mình nha ! Cám ơn nhiều. Xin chân thành cám ơn
Nhờ mọi người ạ giúp e ạ cần gấp ạ
Chào mọi người ! Mình là thành viên mới mong mọi người giúp đỡ ạ