pạn nào giải giúp mình bài này trước 16h đc ko ( mình năn nỉ đó )

càng sớm càng tốt nhe ( cảm ơn nhìu nhe)

a)1200

b)-4653

c)3528

d)-6400

g)-5000

h)-1200

i)-13400

nek bn

a) 

b) \(tanOAB=\dfrac{OB}{OA}=\dfrac{5}{\dfrac{5}{3}}=3\Rightarrow\widehat{OAB}=71^o34'\)

11d

12a

13c

14a

15a

16c

11D

12A

13C

14A

15A

16C

Ta coi hình vẽ là tam giác ABC vuông tại A với B là đỉnh ngọn đèn

góc BCA=30^o(2 góc so le trong)

Theo tỉ số lượng giác trong tam giác vuông ta có:

CA=AB : tan_C30

CA=35:tan30=60,6(m)

Vậy khoảng cách từ chân đèn đến hòn đảo là 60,6m

mn giúp em vs ạ em cần gấp cảm ơn ạ 

bài IX:

1. no sooner returned from his walk than he got down to writing

2. Hard as he worked, he failed

3. you keep calm, you will pass

4. apologized for going to

5.  the song without any

6. em làm đúng rồi

7. it hard to translate this poem

8. had such a fierce dog that nobody dared to enter

9. Hoa nor her brother answered my

10. my clothes to be ironed by my younger sister

bài VIII:

1. I didn't have enough time to go back home for my umbrella.

2. Your cat needed to be looked after properly.

3. There weren't any gifts for me, were they?

4. If only I had studied harder at school.

5. Would you mind coming and collecting me from the station?

6. The harder you work, the more success you get.

7. Minh was not allowed to go out at night by Mr. Ba.

8. You must have been proud of your son's success.

9. I have moved to the construction company for 3 years.

10. The football players are still training.

?

Câu 25: B

b) Đặt (d3): y=ax+b

Vì (d3)//(d1) nên \(a=-\dfrac{2}{3}\)

Vậy: (d3): \(y=\dfrac{-2}{3}x+b\)

Thay x=6 vào (d2), ta được:

\(y=-2\cdot6+4=-12+4=-8\)

Thay x=6 và y=-8 vào (d3), ta được:

\(\dfrac{-2}{3}\cdot6+b=-8\)

\(\Leftrightarrow b=-4\)

Vậy: (d3): \(y=\dfrac{-2}{3}x-4\)