Giúp mình bài III
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Khách
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TG
giải giúp mình bài II vs III ạ mình làm rồi nhưng sợ sai (4 điểm)
2
S
_silverlining
CTVVIP
11 tháng 2 2022
Bài II, câu 3 chọn I
4 - high
5 - ride
6 - put it on
7 - happy
9 - looking
10 - not to smoke
Bài III
2 - C
4 - A
TH
10 tháng 9 2018
Soạn bài từ mượn
I. Từ thuần Việt và từ mượn Học sinh dựa vào từ điển tiếng Việt để giải thích :
1. - Trượng. - Tráng sĩ.
2. Các từ trên có nguồn gốc từ ngôn ngữ Hán.
3. Những từ tiếng Hán : sứ giả, điệu, giang sơn. Những từ mượn các ngôn ngữ khác : tivi, xà phòng, mít ting, ra-đi-ô, ga, Xô-viết, in-tơ-nét.
4. - Với các từ mượn từ đã Việt hóa chúng ta viết như từ thuần Việt. - Với các từ mượn chưa Việt hóa (tiếng châu Âu) chúng ta nên dùng dấu gạch ngang giữa các tiếng.
II. Nguyên tắc mượn từ.
1. Mượn từ để làm giàu tiếng Việt
2. Không nên mượn từ nước ngoài tùy tiện.
III. Luyện tập
Câu 1. - Những từ mượn từ tiếng Hán. + Vô cùng ; tự hiên ; sính lễ. + Gia nhân. + Quyết định ; lãnh địa. - Những từ mượn tiếng châu Âu : lốp, in-tơ-nét.
Câu 2. Hãy xác định nghĩa của các tiếng tạo thành các từ Hán Việt dưới đây. a. - Giả : tiếng dùng để chỉ người hay vật, ở đây là người, kẻ. - Khán : nhìn trông coi. - Thính : nghe. - Độc : đọc b. - Yếu : quan trọng, cần gấp. - Điểm : vết đen, cái chấm, là điểm. - Lược : tóm tắt những điều cơ bản, chủ yếu. - Nhân : người.
Câu 3. Kể một số từ mượn : a. Mét, ki-lô-mét, xen-ti-mét, ki-lô-gam, lít, đấu (thóc), tá (bút)… b. Ghi đông, phuốc-tăng, đĩa xiđi…
Câu 4. - Đó là : phôn, fan, nốc ao. - Dùng những từ này trong giao tiếp sinh hoạt với những bạn bè của mình.
Câu 5. Chép chính tả lưu ý các từ mượn.
10 tháng 9 2018
bạn cũng có thể tham khảo trong sách để học tốt ngữ văn 6 nha!
#khoa#
TM
6 tháng 4 2023
Bài III.2b.
Phương trình hoành độ giao điểm của \(\left(P\right)\) và \(\left(d\right)\) : \(x^2=\left(m+1\right)x-m-4\)
hay : \(x^2-\left(m+1\right)x+m+4=0\left(I\right)\)
\(\left(d\right)\) cắt \(\left(P\right)\) tại hai điểm nên phương trình \(\left(I\right)\) sẽ có hai nghiệm phân biệt. Do đó, phương trình \(\left(I\right)\) phải có :
\(\Delta=b^2-4ac=\left[-\left(m+1\right)\right]^2-4.1.\left(m+4\right)\)
\(=m^2+2m+1-4m-16\)
\(=m^2-2m-15>0\).
\(\Rightarrow m< -3\) hoặc \(m>5\).
Theo đề bài : \(\sqrt{x_1}+\sqrt{x_2}=2\sqrt{3}\)
\(\Rightarrow\left(\sqrt{x_1}+\sqrt{x_2}\right)^2=\left(2\sqrt{3}\right)^2=12\)
\(\Leftrightarrow x_1+x_2+2\sqrt{x_1x_2}=12\left(II\right)\)
Do phương trình \(\left(I\right)\) có hai nghiệm khi \(m< -3\) hoặc \(m>5\) nên theo định lí Vi-ét, ta có : \(\left\{{}\begin{matrix}x_1+x_2=-\dfrac{b}{a}=-\dfrac{-\left(m+1\right)}{1}=m+1\\x_1x_2=\dfrac{c}{a}=\dfrac{m+4}{1}=m+4\end{matrix}\right.\).
Thay vào \(\left(II\right)\) ta được : \(m+1+2\sqrt{m+4}=12\)
Đặt \(t=\sqrt{m+4}\left(t\ge0\right)\), viết lại phương trình trên thành : \(t^2-3+2t=12\)
\(\Leftrightarrow t^2+2t-15=0\left(III\right)\).
Phương trình \(\left(III\right)\) có : \(\Delta'=b'^2-ac=1^2-1.\left(-15\right)=16>0\).
Suy ra, \(\left(III\right)\) có hai nghiệm phân biệt :
\(\left\{{}\begin{matrix}t_1=\dfrac{-b'+\sqrt{\Delta'}}{a}=\dfrac{-1+\sqrt{16}}{1}=3\left(t/m\right)\\t_2=\dfrac{-b'-\sqrt{\Delta'}}{a}=\dfrac{-1-\sqrt{16}}{1}=-5\left(ktm\right)\end{matrix}\right.\)
Suy ra được : \(\sqrt{m+4}=3\Rightarrow m=5\left(ktm\right)\).
Vậy : Không có giá trị m thỏa mãn đề bài.
TM
6 tháng 4 2023
Bài IV.b.
Chứng minh : Ta có : \(OB=OC=R\) nên \(O\) nằm trên đường trung trực \(d\) của \(BC\).
Theo tính chất hai tiếp tuyến cắt nhau thì \(IB=IC\), suy ra \(I\in d\).
Suy ra được \(OI\) là một phần của đường trung trực \(d\) của \(BC\) \(\Rightarrow OI\perp BC\) tại \(M\) và \(MB=MC\).
Xét \(\Delta OBI\) vuông tại \(B\) có : \(MB^2=OM.OI\).
Lại có : \(BC=MB+MC=2MB\)
\(\Rightarrow BC^2=4MB^2=4OM.OI\left(đpcm\right).\)
Tính diện tích hình quạt tròn
Ta có : \(\hat{BAC}=\dfrac{1}{2}sđ\stackrel\frown{BC}\Rightarrow sđ\stackrel\frown{BC}=2.\hat{BAC}=2.70^o=140^o\) (góc nội tiếp).
\(\Rightarrow S=\dfrac{\pi R^2n}{360}=\dfrac{\pi R^2.140^o}{360}=\dfrac{7}{18}\pi R^2\left(đvdt\right)\)
28 tháng 6 2017
III - II = I
X + X = XX
IV + V = IX
XXII - XX = II
V - I = IV
LT
25 tháng 7 2021
III. Rewrite these sentences
1. This room is wider than that one
Þ That room is narrower than this one.
Þ That room is not as wide as this one.
2. Linda drives more carefully than Peter
Þ Peter drives more carelessly than Linda.
Þ Peter doesn't drive as carefully as Linda.
Þ Peter is a more careless driver than Linda.
3.Your car is more convenient than mine
Þ My car is more inconvenient than yours.
Þ My car isn't as convenient as yours.
4. I talk more politely than her
Þ She talkes more impolitely than me.
Þ She doesn't talk as politely as me.
5. We cook better than him
Þ He cooks worse than us.
Þ He doesn't cook as well as us.
6. Anna isn’t as fat as me
=> I am fatter than Anna.
7. This book isn’t as interesting as that one
Þ That one is more interesting than this one.
8. I don’t work as effectively as he does
=> He works more effectively than me.
9. My bedroom isn’t so comfortable as yours
Þ Your bedroom is more comfortable than mine.
10. John didn’t speak English as well as Mary
=> Mary speaks English better than John.
11. I can swim faster than my brother
=> My brother can swim more slowly than me.
=> My brother can not swim as fast as me.
12. Jack studies worse than Peter
=> Peter studies better than Jack.
=> Peter doesn't study as badly as Jack.
IV. Rewrite the second sentence in such a way that it has the same meaning as the one before it
1. Jane can swim further than I can
I can’t swim as far as Jane.
2. My sister can’t cook as well as my mother does
My mother can cook better than my sister.
3. I don’t play tennis as well as my brother does
My brother plays tennis better than me.
4. Apples are cheaper than oranges
Apples are not expensive as oranges.
Oranges are more expensive than apples.
5. Cats can’t swim as well as dogs can
Dogs can swim better than cats.
6. The dress is cheaper than the skirt
The dress is not as expensive as the skirt.
10. They understand more than we do
We don’t understand as much as them.
We understand less than them.
13. His mother is taller than his father
His father is not as tall as his mother.
His father is shorter than his mother.
14. She drives faster and more carelessly than me
I drive more slowly and more carefully than her.
15. Jane can cook better than Robert
Robert can’t cook as well as Jane.
Robert can cook worse than Jane.
V. Rewrite the sentences
1. Since Jack studied hard, he passed the exam
Þ Because of studying hard, Jack passed the exam.
2. Because of putting on warm clothes, they didn’t feel cold
Þ Because they put on warm clothes, they didn't feel cold.
3. I set up a company since I had enough money
Þ Due to having enough money, I set up a company.
4. Because of not being happy, she turned down the invitation
Þ Since she wasn't happy, she turned down the invitation.
5. We couldn’t put up with the boredom due to not living in the city
Þ Because we didn't live in the city, we couldn't put up with the boredom.
6. Although I turned up late, I knew everything
Þ Despite turning up late, I knew everything.
7. In spite of having a headache, he switched on the TV
=> Even though he had a headache, he switched on the TV.
8) In spite of his good salary, Tom gave up his job.
=> Although Tom's salary was good, he have up his job.
9) Although the weather was bad, she went to school on time.
=> Despite the bad weather, she went to school on time.
10) In spite of the high prices, my daughter insists on going to the movies.
=> Even though the prices are high, my daughter insists on going to the movies.
DT
Đỗ Thanh Hải
CTVVIP
25 tháng 7 2021
III. Rewrite these sentences
1. This room is wider than that one
Þ That room …is not as wide as this one…………………………………………..
Þ That room…………is narrower than this one………………………………………
2. Linda drives more carefully than Peter
Þ Peter………doesn't drive as carefully as Linda……………………………………
Þ Peter……drives more carelessly than Linda……………………………………………..
Þ Peter………is a more careless driver than Linda…………………………………
3.Your car is more convenient than mine
Þ My car …is less convenient than yours…………………………………………………..
Þ My car………is not as convenient as yours……………………………………………..
4. I talk more politely than her
Þ She………talks less politely than I do……………………………………………….
Þ She ……doesn't talk as politely as I do…………………………………………………
5. We cook better than him
Þ He………cooks worse than us……………………………………………………..
Þ He ……doesn't cook as well as us…………………………………………………………
6. Anna isn’t as fat as me
=> I …am fatter than Anna………………………………….
7. This book isn’t as interesting as that one
Þ That one ….....is more interesting than this book...................................................
8. I don’t work as effectively as he does
=> He ……works more effectively than I do…………………………………….
9. My bedroom isn’t so comfortable as yours
Þ Your bedroom…is more comfortable than mine…………………………..
10. John didn’t speak English as well as Mary
=> Mary …speaks English better than John……………………………………….
11. I can swim faster than my brother
=> My brother can……swim more slowly than I can…………………………………………
=> My brother can………not swim as fast as I can…………………………………………….
12. Jack studies worse than Peter
=> Peter…studies better than Jack…………………………………..
=> Peter doesn't study as badly as Jack…………………………………………….
IV. Rewrite the second sentence in such a way that it has the same meaning as the one before it
1. Jane can swim further than I can
I can’t______swim as far as Jane_______________________________________________________________
2. My sister can’t cook as well as my mother does
My mother can_______cook better than my sister can_______________________________________________________
3. I don’t play tennis as well as my brother does
My brother______plays tennis better than me____________________________________________________________
4. Apples are cheaper than oranges
Apples are not____as expensive as orange___________________________________________________________
Apples are_______________________________________________________
5. Cats can’t swim as well as dogs can
Dogs can_____swim better than cats______________________________________________________________
6. The dress is cheaper than the skirt
The dress is not______not as expensive as the skirt________________________________________________________
10. They understand more than we do
We don’t ___understand as much as they do________________________________________________________________
We_____understand less than they do_____________________________________________
13. His mother is taller than his father
His father is not _______as tall as his mother______________________________________________________
His father is ___shorter than his mother___________________________________________________
14. She drives faster and more carelessly than me
I drive _____more slowly and more carefully than she does________________________________________________________________
15. Jane can cook better than Robert
Robert can’t __cook as well as Jane__________________________________________________________
Robert can_____cook worse than Jane________________________________________________________
V. Rewrite the sentences
1. Since Jack studied hard, he passed the exam
Þ Because of …studying hard, he passed the exam…………………………………………..
2. Because of putting on warm clothes, they didn’t feel cold
Þ Because……they put on warm clothes, they didn’t feel cold ………………………………………
3. I set up a company since I had enough money
Þ Due to……having enough money, I set up a company………………………………………………..
4. Because of not being happy, she turned down the invitation
Þ Since………she wasn't happy, she turned down the invitation……………………………………………….
5. We couldn’t put up with the boredom due to not living in the city
Þ Because …we didn't live in the city, We couldn’t put up with the boredom …………………………………………………………...
6. Although I turned up late, I knew everything
Þ Despite ……turning up late, I knew everything…………………………………….
7. In spite of having a headache, he switched on the TV
=> Even though…he had a headache,he switched on the TV ………………………………………………………………
8) In spite of his good salary, Tom gave up his job.
=> Although……his salary is good , Tom gave up his job.…………………………………………………..
9) Although the weather was bad, she went to school on time.
=> Despite …the bad weather, she went to school on time.…………………………………………………………..
10) In spite of the high prices, my daughter insists on going to the movies.
=> Even though …the prices are high, my daughter insists on going to the movies. ………………………………………………………………..
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