giúp e câu 1
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NL
Nguyễn Lê Phước Thịnh
14 tháng 8 2023
Đúng(0)
Những câu hỏi liên quan
19 tháng 10 2023
Về câu 3 mình cảm thấy bạn trả lời ổn rồi.
Câu 4:
Chủ đề của bài thơ: tình cảm gia đình ( cụ thể với người mẹ ).
Câu 5:
Qua đoạn thơ trên em cảm nhận được tình yêu thương sâu sâu sắc và nỗi nhớ của tác giả đối với người mẹ của mình. Hồi tưởng về quá khứ, hình ảnh tác giả nhớ nhất chính là người mẹ. Nét cười đen nhánh, hình dáng của mẹ chưa xóa mờ trong kí ức. Tất cả đều chứa chan nỗi nhớ về hình ảnh mẹ thuở xưa kia. Qua đó,ta thấy được giá trị đạo đức cao đẹp của người Việt Nam, đó là tình cảm gia đình thiêng liêng, sâu sắc.
DT
Đỗ Thanh Hải
CTVVIP
21 tháng 5 2021
1 I asked her if she had met my friend
2 He asked me if I could swim
3 Nam told Lan he was writing to her friend that night
4 They told him they gave him a pen
5 Peter told Mary her father had just come to his house
6 Mr Hiep told the pupils he often gave them good advice
7 She told him she had met him at the beach the day before
8 Nam asked Hong if she had been tired the day before
1 She asked Nam where he was going
2 They asked Hoa what her friend had read
9 I asked Peter why he went to her house
10 Lan asked Huong when she would visit her friend?
11 He asked her what her name was
12 Yom asked Mart where she had met his sister
13 Peter asked Daisy if she was writing to his brother
14 Peter told Mary to bring him her pen
15 She told him not to tell her brother about it
16 Mai told Huong to go to her friend's house with her
17 Hong told Nam to try his best
18 He told me not to go out alone at night
19 He asked me if I visited his friend often
20 She asked me if I liked her
21 He asked Hoa what had made her sad
22 Mr Pike asked Mary where she often went
23 She said she would go to visit Nha Trang
24 Mary told Tom she had seen his friend going with her friend
25 I said I would go to visit her
26 Lan told me she gad read my book ten days before
27 Hoa told Hung she had been writing to him
28 She asked him why he hadn't gone to the party the day before
29 Peter asked Daisy where they were going to meet each other the next Sunday
30 he asked Hoa of she had met her friend
21 tháng 5 2021
1. I asked her if she had met my friend.
2. He asked me if I could him.
3. Nam said to Lan that he was writing to her friend that night.
4. They offered to give him a pen.
5. Peter said to Mary that her father had just come to his house.
6. Mr Hiep said to the pupils that he often gave them good advice.
7. She said to him that she had met him the day before.
8. Nam asked Hong if she had been tired the day before.
1. She asked Nam where he was going.
2. They asked Hoa what her friend had read.
9. They asked Peter why he didn't go to her house.
10. Lan asked Huong when she would visit her friend.
11. He asked her what her name was.
12. Tom asked Mary where she had met his siter.
13. Peter asked Daisy if she was writing to his brother.
14. Peter asked Mary to bring him her pen.
15. She asked him not to tell her mother about it.
16. Mai asked Huong to go to her friend's house with her.
17. Huong encouraged Nam to try his best.
18. He warned her not to go out alone at night.
19. He asked me if I visited his friend often.
20. She asked me if I liked her.
SV
Sinh Viên NEU
CTVVIP
15 tháng 11 2023
1 If we continue polluting the air, the environment will be affected seriously
2 If we don't stop damaging birds' homes, there will be fewer birds left
3 If we continue polluting the water, there will be more disease in people and animals
4 If we keep polluting the land, the soil will not be safe enough for us to grow food in
5 If we use public transportation when we need, there will be less air pollution
12 Daniel signs up for a clean-up campaign so that he can join in it
13 People in my neighborhood clean the park up so that their children will have a nice place to play
14 Almost all the students in my school plant trees so that they can have much fresher air
TP
gấp mn giúp em câu này vs ạ e gấp lắm mn giúp em vs em cảm ơn ạ
0
NV
Nguyễn Việt Lâm
Giáo viên
28 tháng 2 2023
c.
Gọi E là trung điểm AD \(\Rightarrow EM\) là đường trung bình tam giác SAD
\(\Rightarrow\left\{{}\begin{matrix}EM=\dfrac{1}{2}SA=a\\EM||SA\Rightarrow EM\perp\left(ABCD\right)\end{matrix}\right.\)
\(\Rightarrow EC\) là hình chiếu vuông góc của CM lên (ABCD)
\(\Rightarrow\widehat{MCE}\) là góc giữa SM và (ABCD)
\(ED=\dfrac{1}{2}AD=a\Rightarrow EC=\sqrt{CD^2+ED^2}=a\sqrt{2}\)
\(\Rightarrow tan\widehat{MCE}=\dfrac{EM}{EC}=\dfrac{\sqrt{2}}{2}\Rightarrow\widehat{MCE}=...\)
e.
Gọi O là trung điểm BD, qua A kẻ đường thẳng song song BD cắt OE kéo dài tại F
\(\Rightarrow ABOF\) là hình bình hành (2 cặp cạnh đối song song)
\(\Rightarrow\left\{{}\begin{matrix}AF=OB=\dfrac{1}{2}BD\\AF||BD\end{matrix}\right.\)
Lại có MN là đường trung bình tam giác SBD \(\Rightarrow\left\{{}\begin{matrix}MN=\dfrac{1}{2}BD\\MN||BD\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}MN=AF\\MN||AF\end{matrix}\right.\) \(\Rightarrow ANMF\) là hình bình hành
\(\Rightarrow AN||MF\Rightarrow\left(AN;CM\right)=\left(AN;MF\right)=\widehat{CMF}\) nếu nó ko tù hoặc bằng góc bù của nó nếu \(\widehat{CMF}\) là góc tù
Ta có: \(MF=AN=\dfrac{a\sqrt{5}}{2}\) ; \(CM=\sqrt{CE^2+EM^2}=a\sqrt{3}\)
ABOF là hình bình hành nên AODF cũng là hình bình hành \(\Rightarrow E\) là tâm hình bình hành
\(\Rightarrow EF=OF=\dfrac{AB}{2}=\dfrac{a}{2}\)
Gọi G là giao điểm OE và BC \(\Rightarrow FG=EG+EF=a+\dfrac{a}{2}=\dfrac{3a}{2}\)
\(\Rightarrow CF=\sqrt{FG^2+CG^2}=\dfrac{a\sqrt{13}}{2}\)
ĐỊnh lý hàm cos:
\(cos\widehat{CMF}=\dfrac{CM^2+MF^2-CF^2}{2CM.MF}=\dfrac{\sqrt{15}}{15}\Rightarrow\widehat{CMF}\)
