( >T^T)>
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17 tháng 2 2017
Bài giải đã giải thích rồi mà......Với 0<t<1 =>\(\left\{\begin{matrix}t^3>0\\1-t>0\end{matrix}\right.\) tích hai số dương => phải dương
4 tháng 1 2017
Ta có: \(M>\frac{x}{x+y+z+t}+\frac{y}{x+y+z+t}+\frac{z}{x+y+z+t}+\frac{z}{x+y+z+t}=\frac{x+y+z+t}{x+y+z+t}=1\left(1\right)\)
Lại có \(M< \frac{x+t}{x+y+z+t}+\frac{y+z}{x+y+z+t}+\frac{z+x}{x+y+z+t}+\frac{t+y}{x+y+z+t}\)
\(=\frac{2\left(x+y+z+t\right)}{x+y+z+t}=2\left(2\right)\). Từ (1) và (2) suy ra \(1< M< 2\)
Vậy M không phải là số tự nhiên
22 tháng 6 2020
\(3Fe+2O_2\rightarrow Fe_3O_4\left(HH\right)\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\left(The\right)\\ 2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe\left(The\right)\)
Cứ tiếp tục mà cân bằng nhé bạn :v mình vã quá rồi, bạn chỉ cần để ý nếu như
-bên chỗ chất phản ứng với sản phẩm mà lớn hơn 2 chất hay hợp chất gì đấy thì cứ đem vô phản ứng thế
- số chất phản ứng là lớn hơn hoặc bằng 2 trở lên còn sản phẩm là 1 thì cho vô phản ứng hóa hợp
- số chất phản ứng là 1 còn sản phẩm lớn hơn hoặc bằng 2 thì cho vô phản ứng phân hủy
27 tháng 8 2018
1. If you don't see that film, you'll be sorry.
>> unless you see that film, you'll be sorry.
2. If you don't take morning exercises, you will be weak .
>> Unless you take morning exercises, you will be weak .
3. You will ger lost if you don't take a map with you.
>> Unless you take a map with, you will get lost .
4. They will kill him if he doesn't tell them the truth.
>> Unless he tells them the truth, they will kill him.
5. If we don't protect the forests, the environments will be so destroyed.
>> Unless we protect the forests, the environments will be so destroyed.
6. I will wait for her if she calls me.
>> Unless she calls me, I will not wait for her.
Còn lại làm tương tự nhé :))
SY
6 tháng 1 2020
3/ Have you told her about the present ( Passive )
--> Has she been told about the present ?
4/ Tom is answering this question at the momments ( Passive )
--> This question is being answered by Tom at the moment.
LT
6 tháng 1 2020
1/ Ann didn't pass the antrance examination, so she wasn't admitted to the university.
--> If An wass pass the antrance examination, she wouldn't admitted to the university.
--> Unless passed the antrance examination, so she wasn't admitted to the university.
2/ I am not at home now, so I can't answer your phone.
--> If I am not at home now, I Will answer your phone.
--> Unless I am at home now , I canswer your phone.
3/ Have you told her about the present ( Passive )
-->.....
4/ Tom is answering this question at the momments ( Passive )
-->.......
5/ I fell asleep because the film was so boring.
--> If the film was so boring, I would fell asleep
--> Unless the film was so boring, I wouldn'd fell asleep
6/ Because he cut these young trees. He was punished.
--> If he cutted these young trees, He would punished.
--> Unless he cutted these young trees, He wouldn't punished.
7/ If she doesn't work harder, she will lose the job.
--> If she works harder, she won't lose the job.
--> Unless she works harder, she will lose the job.
8/My boyfriend didn't give me the address, so I couldn't meet him.
--> If My boyfriend wass give me the address, I couldn't meet him.
--> Unless My boyfriend gave me the address, I couldn't meet him.
9/ We couldn't visit the museum because we didn't have enough time.
--> If we didn't have enough time, We couldn't visit the museum
--> Unless we had enough time, We couldn't visit the museum
10/ She does a lot of household chores so she fells very tired.
--> If She does a lot of household chores s, she will fell very tired.
--> Unless She doesn't do a lot of household chores , she will fells very tired.
11/ It is rainning now, so I will not go for a walk.
--> If It is rainning now, I will not go for a walk.
--> Unless It is rainning now, I won't not go for a walk.
12/ The building is too high. He can't climp up
--> If The building was too high, He coldn't climp up
--> Unless The building Was too high, He could climp up
13/ I couldn't make a film because I wasn't a good director
--> If I wasn't a good director, I couldn't make a film
--> Unless I was a good director, I couldn't make a film
14/ He didn't work hard last term, he lost his job.
--> If He wasn't work hard last term, he could lost his job.
---> Unless He was work hard last term, he could lost his job.
3 tháng 9 2018
1.she didn't eat anything because she wasn't hungry
>>if.she had been hungry,she would have been eaten...
2. it didn't rain,so my vegetables in the garden could hot grow well
>>if..it had rained,my vegetables in the garden could have grown well..
3.i didn't see the signal, so i didn't stop
>>if..i had seen the signal,i would have stopped..
4. they missed their plan because they got in the bad traffic
>>if they hadn't got in the bad traffic,they wouldn't have missed their plan
5.dick often cause accidents because he driver carelessly
>>if dick didn't drive carelessly,he wouldn't often cause accidents
6. listen carefully or you won't understand the lesson
>>if you don't listen carefully,you won't understand the lesson
NN
3 tháng 8 2018
I. Combine two sentences using "enough" and "too"
1.The worker is clever. He can make fine things from wood. (enough)
=>.........The worker is clever enough to make fine things from wood. ..............................................................................................
2. He is very intelligent. He can resolve that problem. (enough)
=>........... He is intelligent enough to resolve that problem. (enough).............................................................................................
3. This tractor is very powerful. The farmer can plough the field in only half an hour. (enough)
=>....................This tractor is powerful enough for The farmer to plough the field in only half an hour.....................................................................................
4. That acrobat was very brave and clever. The children admired him. (enough)
=>........... That acrobat was brave and clever enough for The children to admire him..............................................................................................
5. It rains a lot. The plants can grow properly. (enough)
=>................It rains enough for The plants to grow properly.........................................................................................
6. He doesn't speak clearly. The students can't understand him. (too/enough)
=>...........He didn't speak too clearly for The students to understand him..............................................................................................
=>....... He doesn't speak clearly enough for The students to understand him..................................................................................................
7. It doesn't rain much. The plant can't grow well. (too/enough)
=>..............It rains too little for The plant to grow well..........................................................................................
=>...............It doesn't rain much enough for The plant to grow well..........................................................................................
8. Mr.Robinson is poor. He can't buy a house. (too/enough)
=>..................Mr.Robinson is too poor to buy a house.......................................................................................
=>.....................Mr.Robinson isn't rich enough to buy a house....................................................................................
9. He doesn't ear much money. He can't buy that house. (too/enough)
=>.........He earns too little money to buy that house. ...............................................................................................
=>..................He doesn't earn much money enough to buy that house. ......................................................................................
H
26 tháng 8 2018
) I don't have a car
==>l will l had a car
2) I can’t play the piano.
==>l wish l could play the piano
3) I'm at work
==>l wish l wasn't at work
4) It's winter
==>I wish that it weren’t winter
5) I'm ill
==>l wish l wasn't ill
6) I don't have new shoes
==>l wish l had new shoes
7) I can't afford to go on holiday==>
==>l wish l could afford to go on holiday
8) I don't have time to read lots of books
==>l wish l had time to read lots of books
9) I can't drive
==>l wish l could drive
10) My laptop is broken
==>l wish my laptop wasn't broken
TL:
a) 157
b) -157
-HT-
TL:
a) 157
b) -157
HT