Mn giải họ em với ạ
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Những câu hỏi liên quan
NM
6
27 tháng 6
1.I think you ought to give up playing video games. (should)
-->I think you should give up playing video games.
2.It's necessary for me to finish the work on time. (have to)
--->I have to finish the work on time.
3.It wasn't necessary for you to clean that car. (have to)
--->You didn't have to clean that car.
4.It was quite unnecessary for you to adopt a green lifestyle. (have to)
---->You didn't have to adopt a green lifestyle.
5.It was careless of you to leave the windows open last night. (shouldn't)
----->You shouldn't have left the windows open last night.
6.It is advisable for each member in the family to share the housework equally. (should)
---->Each member in the family should share the housework equally.
7.You are required to come back home before 10 p.m. (must)
--->You must come back home before 10 p.m.
8.Lina is advised to prepare carefully in the morning. (should)
----->Lina should prepare carefully in the morning.
9.Tu is responsible for picking up litter. (have to)
------>Tu has to pick up litter.
27 tháng 6
1.You are required to ask your parents for permission before staying out late. (must)
You must ask your parents for permission before staying out late.
2.I think you ought to give up smoking immediately. (should)
I think you should give up smoking immediately.
3.It is not a good idea for me to stay up late. (shouldn't)
I shouldn't stay up late.
4.It wasn't necessary for you to send these letters. (have to)
You didn't have to send these letters.
5.It was unnecessary for Tim to finish the work. (have to)
Tim didn't have to finish the work.
6.It was careless of you to leave your children alone at home. (shouldn't)
You shouldn't have left your children alone at home.
Bằng 1 cách nào đó 1 câu hỏi từ 2023 ở đây và tôi vẫn trả lời nó sau 1 năm :v
3N
1
YN
2 tháng 3 2022
1 The distance from my home to school is about 3 km
2 My mum used to live in a small village when she was small
3 Despite being a millionaire , he lives in a small flat
4 when does the festive take place ?
5 It is about two kilometres from my home to school
6 he didn't use to ride his bike to school
7 Despite having a test tomrrow , they are still watching TV now
22 tháng 10 2023
36B
37C
38D
39B
40D
41A
42B
43B
44A
45B
46B
47A
48C
50B
51B
52B
53D
54C
55D
56C
LD
2
22 tháng 10 2021
\(b,B=\dfrac{x-4+2\sqrt{x}+6-3\sqrt{x}-4}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}\\ B=\dfrac{x-\sqrt{x}+2}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}=\dfrac{\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-2\right)}=\dfrac{\sqrt{x}+1}{\sqrt{x}+3}\\ c,M=B:A=\dfrac{\sqrt{x}+1}{\sqrt{x}+3}\cdot\dfrac{\sqrt{x}+3}{x-\sqrt{x}+2}=\dfrac{\sqrt{x}+1}{x-\sqrt{x}+2}\\ M=\dfrac{x-\sqrt{x}+2-x+2\sqrt{x}-1}{x-\sqrt{x}+2}\\ M=1-\dfrac{x-2\sqrt{x}+1}{x-\sqrt{x}+2}=1-\dfrac{\left(\sqrt{x}-1\right)^2}{x-\sqrt{x}+2}\)
Ta có \(\left(\sqrt{x}-1\right)^2\ge0;x-\sqrt{x}+2=\left(\sqrt{x}-\dfrac{1}{2}\right)^2+\dfrac{7}{4}>0\)
Do đó \(\dfrac{\left(\sqrt{x}-1\right)^2}{x-\sqrt{x}+2}\ge0\)
\(\Leftrightarrow M=1-\dfrac{\left(\sqrt{x}-1\right)^2}{x-\sqrt{x}+2}\le1-0=1\)
Vậy \(M_{max}=1\Leftrightarrow\sqrt{x}=1\Leftrightarrow x=1\left(tm\right)\)
22 tháng 10 2021
a: Thay \(x=3+2\sqrt{2}\) vào A, ta được:
\(A=\dfrac{3+2\sqrt{2}-\sqrt{2}-1+2}{\sqrt{2}+1+3}=\dfrac{4+\sqrt{2}}{4+\sqrt{2}}=1\)
4 tháng 1 2022
a: Xét tứ giác ABDM có
DM//AB
AM//DB
Do đó: ABDM là hình bình hành
b: Xét ΔCAB và ΔCDB có
CA=CD
BA=BD
CB chung
Do đó: ΔCAB=ΔCDB
Suy ra: \(\widehat{CAB}=\widehat{CDB}=90^0\)
hay BD⊥DC
AN
2
NV
Nguyễn Việt Lâm
Giáo viên
10 tháng 8 2021
Từ đồ thị ta thấy \(f'\left(x\right)>0\) trên các khoảng \(\left(-1;1\right)\) và \(\left(3;+\infty\right)\)
\(f'\left(x\right)< 0\) trên \(\left(-\infty;-1\right)\) và \(\left(1;3\right)\)
\(\Rightarrow\) Hàm nghịch biến trên (1;3)
NV
Nguyễn Việt Lâm
Giáo viên
16 tháng 7 2021
33.
\(\dfrac{1}{2}cos2x+\dfrac{\sqrt{3}}{2}sin2x=cosx\)
\(\Leftrightarrow cos\left(2x-\dfrac{\pi}{3}\right)=cosx\)
So sánh nó với \(cos\left(2x-a\right)=cosx\)
\(\Rightarrow a=\dfrac{\pi}{3}\)
34.
ĐKXĐ:
\(sinx-cosx\ne0\)
\(\Leftrightarrow tanx\ne1\)
\(\Leftrightarrow x\ne\dfrac{\pi}{4}+k\pi\)
NV
Nguyễn Việt Lâm
Giáo viên
16 tháng 7 2021
35.
\(y=2\left(\dfrac{\sqrt{3}}{2}sinx-\dfrac{1}{2}cosx\right)-2=2sin\left(x-\dfrac{\pi}{6}\right)-2\)
Do \(-1\le sin\left(x-\dfrac{\pi}{6}\right)\le1\Rightarrow-4\le y\le0\)
Tập giá trị: \(\left[-4;0\right]\)
36.
\(y=cos2x\) tuần hoàn chu kì \(\dfrac{2\pi}{\left|2\right|}=\pi\)
\(y=sinx\) tuàn hoàn chu kì \(\dfrac{2\pi}{\left|1\right|}=2\pi\)
\(y=tan2x\) tuần hoàn chu kì \(\dfrac{\pi}{\left|2\right|}=\dfrac{\pi}{2}\)
\(y=cot4x\) tuần hoàn chu kì \(\dfrac{\pi}{\left|4\right|}=\dfrac{\pi}{4}\)
LC
0
Bài 1
1 D
2 B
3 A
4 B
5 A
6 D
7 B
8 C
9 C
10 A
11 A
12 B
13 C
14 D
15 A
Bài 3
16 D
17 C
18 C
19 A
20 A
Bài 4
21 A
22 C
23 B
24 A
25 C
Bài 5
26 A
27 D
28 A
29 B
30 C
1D 2B 3A 4B 5A 6D 7B 8C 9C 10A
11C 12B 13C 14D 15A 16D 17C 18C 19B 20A
21A 22C 23B 24A 25C 26A 27D 28A 29C 30C
31. spoke
32. Do you like
33. gave
34. wash
35. will make
36. Don't forget to wake me up at eight tomorrow morning
37. How heavy were you two years ago?
38. Learning English well is not easy
39. I spend two hours getting to Hanoi by motorbike
40. His house is bigger than mine