Một đoạn mạch gồm ba điện trở R1 = 3 W ; R2 = 5 W ; R3 = 7 W mắc nối tiếp với nhau. Cường độ dòng điện trong đoạn mạch là I = 2A.
1/ Tính điện trở tương đương của đoạn mạch.
2/ Tính hiệu điện thế giữa hai đầu mỗi điện trở.
\(R_{tđ}=R_1+R_2+R_3=3+5+7=15\Omega\)
\(I_1=I_2=I_3=I_m=2A\)
\(U_1=I_1\cdot R_1=2\cdot3=6V\)
\(U_2=I_2\cdot R_2=2\cdot5=10V\)
\(U_3=I_3\cdot R_3=2\cdot7=14V\)
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VI. Complete the sentences with the correct comparative form of the adjectives in the box.narrow cold important dangerous fast1. It’s ……………………. in the north of Viet Nam than in the south.2. Is a snake ……………………. than a dog?3. Doing homework is ……………………. than playing video games.4. The streets in my neighbourhood are ……………………. than in your neighbourhood.5. Travelling by air is ……………………. than travelling by bus.
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VI. Complete the sentences with the correct comparative form of the adjectives in the box.
narrow cold important dangerous fast |
1. It’s ……………………. in the north of Viet Nam than in the south.
2. Is a snake ……………………. than a dog?
3. Doing homework is ……………………. than playing video games.
4. The streets in my neighbourhood are ……………………. than in your neighbourhood.
5. Travelling by air is ……………………. than travelling by bus.
colder
more dangerous
more important
narrower
faster
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Viết đoạn văn khoảng 7 câu làm rõ chủ đề sau:
Hai câu thơ đầu của bài thơ cảnh khuya đã cho ta cảm nhận vẻ đẹp thơ mộng của đêm rừng Việt Bắc
Trong đoạn có sử dụng một quan hệ từ và một cặp từ trái nghĩa (gạch chân và chú thích rõ)
Mọi người giúp mình với ạ
125∶ 124−8 .(−5)
Lời giải:
$125:124-8(-5)=\frac{125}{124}+40=\frac{5085}{124}$
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Tìm và giải thích nghĩa của thành ngữ có trong các trường hợp sau:
Anh đã nghĩ thương em như thế thì hay là anh đào giúp cho em một cái ngách sang nhà anh, phòng khi tắt lửa tối đèn có đứa nào đến bắt nạt thì em chạy sang…
thành ngữ tắt lửa tối đèn là nói những điều bất trắc và nhờ giúp đỡ khi gặp khó khăn
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1. MT+TS
2. từ đơn là cầu
từ ghép là đội trưởng
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I/ Rewrite the sentences with “The Present Perfect tense”:1.My father began working for LNP Company five months ago.My father has ______________________________________________________________ 2.They started to take part in the charity activity on March 8th of 2019.They have_______________________________________________________________ 3.When did you first make friends with your pen pal ?How long __________________________________________________________________+ I first knew him last Christmas...
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I/ Rewrite the sentences with “The Present Perfect tense”:
1.My father began working for LNP Company five months ago.
My father has ______________________________________________________________
2.They started to take part in the charity activity on March 8th of 2019.
They have
_______________________________________________________________
3.When did you first make friends with your pen pal ?
How long __________________________________________________________________
+ I first knew him last Christmas.
+ I have _____________________________________________________________________
4.Farmers started using candles for lighting long ago.
Farmers ___________________________________________________________________
5.Did Miss. Linda begin to drive a car when she was at the age of eighteen ? + Yes, she did.
Has ______________________________________________________? +Yes, she _____
6.When did they start advertising this new product ? + A week ago.
How long ______________________________________________ ? +_______________
7.Everyone began discussing about the water pollution here last Monday.
Everyone has ______________________________________________________________
8.He was absent from class three days ago.
He ________________________________________________________________________
9.Did you first meet them in front of Children’s Theater yesterday morning ?
Have ______________________________________________________________________
+No, we didn’t. We met them there three hours ago.
+No, we _____________________________________________________________________
10.Mai and me started to play the golf in July of 2020.
Mai and me ________________________________________________________________
1. My father has worked for LNP Company for five months.
2. They have taken part in the charity activity since March 8th of 2019.
3. How long have you made friends with your pen pal?
+ I have known him since last Christmas.
4. Farmers have used candles for lighting for long time.
5. Has Miss. Linda driven a car since she was at the age of eighteen? Yes, she has.
6. How long have they advertised this new product ? For a week.
7. Everyone has discussed about the water pollution here since last Monday.
8. He has absented from class for three days.
9. Have you met them in front of Children’s Theater since yesterday morning?
No, we haven't. We have met them there for three hours.
10. Mai and me have played the golf since July of 2020.
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1.My father began working for LNP Company five months ago.
My father has worked/ has been working for LNP Company for 5 months.
2.They started to take part in the charity activity on March 8th of 2019.
They have taken part in the charity activity since March 8th of 2019.
3.When did you first make friends with your pen pal ?
How long have you made friends with your pen pal?
+ I have made friends with her/him for 2 months/a long time/ weeks... /since October...
4.Farmers started using candles for lighting long ago.
Farmers have used candles for lighting for (a) long (time).
5.Did Miss. Linda begin to drive a car when she was at the age of eighteen ? + Yes, she did.
Has Miss Linda driven a car since eighteen? +Yes, she has.
6.When did they start advertising this new product ? + A week ago.
How long have they advertised this new product? + A week.
7.Everyone began discussing about the water pollution here last Monday.
Everyone has discussed the water pollution here since last Monday.
8.He was absent from class three days ago.
He has been absent for 3 days.
9.Did you first meet them in front of Children’s Theater yesterday morning ?
Have you met them in front of Children’s Theater since yesterday morning?
+No, we didn’t. We met them there three hours ago.
+No, we haven't. We have met them for 3 hours.
10.Mai and me started to play the golf in July of 2020.
Mai and me have played the golf since July of 2020.
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Viết lại câu
you should know the story of chung cakes and day cakes . You are Vietnamese(if)
cho hai góc kề bù có số đo x,y . Tính x,y biết
a; x,y tỉ lệ thuận với 2 và 3
b; x,y tỉ lệ nghịch với 2 và 3
Giúp mk nha mình cần gấp , ai đúng mk tick cho nha
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\(a,\Rightarrow\dfrac{3}{2}x=\dfrac{1}{4}\Rightarrow x=\dfrac{1}{6}\\ b,\Rightarrow\left[{}\begin{matrix}x-\dfrac{2}{3}=\dfrac{2}{3}\\\dfrac{2}{3}-x=\dfrac{2}{3}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{4}{3}\\x=0\end{matrix}\right.\\ c,\Rightarrow x=\left(1-\dfrac{4}{3}\right)^2+\dfrac{5}{3}-\dfrac{4}{9}=\dfrac{1}{9}-\dfrac{4}{9}+\dfrac{5}{3}=\dfrac{4}{3}\\ d,\Rightarrow x=\dfrac{5^5\cdot7^5\cdot5^{10}}{7^4\cdot5^{18}}=\dfrac{7}{5^3}=\dfrac{7}{125}\)
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