Các bạn giúp mình bài này nhé! Mình cảm ơn! :D
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Những câu hỏi liên quan
ND
1
3 tháng 10 2021
a) Ta có: MN⊥d, EF⊥d
=> MN//EF(từ vuông góc đến song song)
b) Ta có: \(\widehat{MPQ}=180^0-\widehat{MPb}=180^0-55^0=125^0\)(kề bù)
\(\Rightarrow\widehat{MPQ}=\widehat{NMc}=125^0\)
Mà 2 góc này đồng vị
=> PQ//MN
Mà MN//EF
=> PQ//EF
3 tháng 10 2021
Cảm ơn bạn. Bạn có thể giúp mình làm nốt câu c được không?
NQ
Nguyễn Quốc Đạt
CTVVIP
30 tháng 8
Mẫu 1: Chọn phim "The Journey to Mars" (Sunday, 4 p.m.)
Me: What are you doing on Sunday afternoon?
Friend: I’m not doing anything. / Nothing much.
Me: Do you want to see a movie with me?
Friend: Sure. What movie is it?
Me: It's "The Journey to Mars".
Friend: What time does it start?
Me: It starts at 4 p.m.
Friend: Great! See you then.
NQ
Nguyễn Quốc Đạt
CTVVIP
30 tháng 8
Mẫu 2: Chọn phim "The Forest Book" (Saturday, 10 a.m.)
Me: What are you doing on Saturday morning?
Friend: I’m free.
Me: Would you like to go to the movies with me?
Friend: Sounds good. What movie do you want to watch?
Me: How about "The Forest Book"?
Friend: What time is it on?
Me: It's at 10 a.m.
Friend: OK, let's meet at the cinema at 9:45.
NQ
Nguyễn Quốc Đạt
CTVVIP
30 tháng 8
a. Match the verbs with the nouns (Nối các động từ với danh từ)
1 create $\rightarrow$ c. energy (tạo ra năng lượng)
2 drive $\rightarrow$ a. machinery (vận hành máy móc)
3 generate $\rightarrow$ e. electricity (phát/tạo ra điện)
4 turn $\rightarrow$ b. turbines (quay tua-bin)
5 heat $\rightarrow$ d. houses (sưởi ấm nhà cửa)
NQ
Nguyễn Quốc Đạt
CTVVIP
30 tháng 8
b
1 How many types of energy sources are mentioned in the text? What are they?
$\rightarrow$ Two types of energy sources are mentioned. They are renewable and non-renewable energy sources. (hoặc kể tên cụ thể: fossil fuels/coal/oil, hydro power, nuclear power, wind power, solar power)
2 What are the disadvantages of hydro and nuclear power?
$\rightarrow$ Hydro power is expensive to build dams, and nuclear power can be very dangerous.
3 Why do you think the wind and the sun are called alternative sources of energy?
$\rightarrow$ Because they are clean, renewable, and can be used instead of non-renewable sources (fossil fuels).
4 What types of energy does Viet Nam use most?
$\rightarrow$ Viet Nam uses hydro power and fossil fuels (coal, gas, oil) most.
5 What does the professor think Viet Nam will use more in the future?
$\rightarrow$ He thinks Viet Nam will use more renewable energy sources like solar and wind power in the future.
DM
giúp mình bài này với. Mình cần gấp ấy, mik cảm ơn các bạn nhé.
1
C
24 tháng 4 2022
Do you use solar energy in your home?
People won't use flying cars until the year 2050
We must always obey the traffic rules for our safety
The major cause of death for children living in the slums is malnutrition
Solar panels will be installed on the roof of our house next week
Veronica is a good friend of mine
Pollution is the most serious problem
TN
27 tháng 8 2021
1. hard enough
2. well enough
3. warm enough
4. rich enough
5. enough money
6. enough time
7. strong enough
8. enough French
9. far enough
10. enough chairs
(P/s: nãy h ngồi làm mợt lắm á , tick cho tui nghen (～￣▽￣)～)
GH
3
4: \(D=x^2-2\cdot x\cdot\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{3}{4}\)
\(=\left(x-\dfrac{1}{2}\right)^2+\dfrac{3}{4}\ge\dfrac{3}{4}\forall x\)
Dấu '=' xảy ra khi \(x=\dfrac{1}{2}\)
\(A=\left(x^2-6x+9\right)-7=\left(x-3\right)^2-7\ge7\\ A_{min}=7\Leftrightarrow x=3\\ B=\left(9x^2+6x+1\right)-4=\left(3x+1\right)^2-4\ge-4\\ B_{min}=-4\Leftrightarrow x=-\dfrac{1}{3}\\ C=\left(x^2-2\cdot\dfrac{5}{2}x+\dfrac{25}{4}\right)-\dfrac{9}{4}=\left(x-\dfrac{5}{2}\right)^2-\dfrac{9}{4}\ge-\dfrac{9}{4}\\ C_{min}=-\dfrac{9}{4}\Leftrightarrow x=\dfrac{5}{2}\\ D=\left(x^2-x+\dfrac{1}{4}\right)+\dfrac{3}{4}=\left(x-\dfrac{1}{2}\right)^2+\dfrac{3}{4}\ge\dfrac{3}{4}\\ D_{min}=\dfrac{3}{4}\Leftrightarrow x=\dfrac{1}{2}\)
\(E=3\left(x^2+2\cdot\dfrac{1}{3}x+\dfrac{1}{9}\right)-\dfrac{4}{3}=3\left(x+\dfrac{1}{3}\right)^2-\dfrac{4}{3}\ge-\dfrac{4}{3}\\ E_{min}=-\dfrac{4}{3}\Leftrightarrow x=-\dfrac{1}{3}\\ F=x^2-2x+1+x^2-4x+4+2021\\ F=2\left(x^2-3x+\dfrac{9}{4}\right)+\dfrac{4031}{2}=2\left(x-\dfrac{3}{2}\right)^2+\dfrac{4031}{2}\ge\dfrac{4031}{2}\\ F_{min}=\dfrac{4031}{2}\Leftrightarrow x=\dfrac{3}{2}\)