a. \(R=\dfrac{R1.R2}{R1+R2}=\dfrac{3.6}{3+6}=2\Omega\)

b. \(U_{AB}=R.I_{AB}=2.2=4V\)

c. \(U_{AB}=U1=U2=4V\)(R1//R2)

\(\left\{{}\begin{matrix}I1=U1:R1=4:3=1,\left(3\right)A\\I2=U2:R2=4:6=0,\left(6\right)7A\end{matrix}\right.\)

:v?

bài??????

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Phần 1

1A

2D

3A

4C

1A
2D

3A

4C

a) XÉT ΔAHB Vuông tại H, ΔAHC Vuông tại H có

AB=AC (ΔABC Cân tại A) 

\(\widehat{B}\)=\(\widehat{C}\) (ΔABC Cân tại A)

⇒ΔAHB =ΔAHC (C.HUYỀN-G.NHỌN)

b)Xét ΔANM và ΔCND ,có

NA=NC (N là trung điểm của AC)

\(\widehat{ANM}=\widehat{CND}\)(Đối đỉnh) 

NM=ND (gt)

⇒ΔANM = ΔCND (c-g-c) 

⇒AM=CD (2 cạnh tương ứng) 

Ta có : \(\widehat{MAN}=\widehat{DCN}\) (ΔANM = ΔCND)

⇒AB // CD (So le trong)

Bạn có thể tách 2 đề riêng ra và chụp rõ hơn đc ko? Mk sẽ giúp bạn

Part 3

I

1 T

2 F

II

3 My family can receive much happiness from doing volunteer

4 My family raises some fund for them, and also cook meal for them

Part IV

I

1 Although I was tired last night, I stayed up late to watch a game show

2 Ha noi is smaller than HCM City

II

1 Sleep more, but try to wake up at the usual time

2 Be careful with what you eat and drink

III

1 - B

2 - D

3 - A

4 - E

5 - F

B

6 so

7 or

8 because

9 and

10 more

Part 1

1 on

2 as

3 who

4 so

5 well

6 didn't

Part 2

1 - G

2 - A

3 - F

4 - B

5 - C

6 - D

Part 3 

1 have walked

2 learnt

3 watches

4 playing

5 be done

6 impressed

7 surprisingly

8 cosumption

Part4

1 reduce => reduces

2 whom => who

part 1

1 ON

2WHOM

3 WHO

4 SO

5 WELL

6 DIDM'T

part 3

1 walk

2 learnt

3 playing

4 impressive

5 suprising