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câu 1:

a) R= \(\rho.\dfrac{l}{S}\)= \(1,1\times10^{-6}\times\dfrac{5}{0,068\times10^{-6}}\)= \(\dfrac{1375}{17}\)( Ω)

b) P= \(\dfrac{U^2}{R}=\dfrac{220^2}{\dfrac{1375}{17}}=\dfrac{2992}{5}\left(W\right)\)

c) ta có : I= U/R= 220: 1375/17= 68/25 (A)

=> Q= I2.R.t= (68/25)2.1375/17. 1800=1077120(J)

Câu 2:

a) Rtđ= R1+R2+R3= 19

b) I3= U/R3=12/10=1,2

=> U3= R3.I3= 10.1,2=12

trang ?

 BẠN PHẢI NÓI TRANG CHO MÌNH LÀM CHỨ KHÔNG CHO TRANG THÌ SAO LÀM ĐC

Trang mấy???

mấy bài đó có trong giải mà

mk bt nhưng mà nó giải ko có đầy đủ nên mk ko có chép vào . Bn lm bài đó chưa , nếu bn có đt thì chụp mấy bài đó cho mk xem đi đc hog , mà nếu chưa ak thì bn bt lm bài nào thì bn lm mk ko bắt bn lm hết đâu nhé ! lm s cho đầy đủ và dễ hỉu giúp mk nha!

bài 1

P: cao x thấp

F1: 100% cao

=>cao trội hoàn toàn so với 1hấp

Quy ước : A : cao; a : 1hấp

P : AA (cao/) x aa (thấp)

G    A               a

F1: Aa (100%cao)

F1: Aa (cao) x Aa (cao)

G   A , a           A , a

F2: 1AA :2Aa :1aa

TLKH : 3 cao : 1 thấp

XVI. Supply the correct verb form:

1. Mark(eat)..has eaten......dinner already. He is not hungry

2. Beth (write)..has written.......three letters today. She misses her family

3. Yoko and Armand (take)..have taken....the test. Now they can relax

4. Mary and I (be)...have been....to Costa Rica three times. We are familiar with the culture

5. I (drink) .have drunk....six cups of water today

6. Eva (sing).has sung......in a chorus before. Her voice is pretty

7. Chong-Li (get)...has gotten....very good at speaking English. She has practiced a lot

8. Luci (hide)..has hiden.....in the woods. Now her friends will try to find her.

9. It (be)..have been.....a good week so far

10. You (show)..have shown...........that you are a hard worker. Good job!

11. Daisy (wear).has worn..... a dress to work everyday this week

12. Mr. Lee (drive) ...has driven.....from Texas to lowa for the conference. He needs to get some rest before it starts

13. Juan (ride)..has ridden...horses since he was a little boy. It is easy for him

14. Mr and Mrs Sam (become)...have become......grandparents. Their daughter had a baby

15. The movie (begin)...has begun.... Please be quite!

16. Charity (not break)...hasn't broken...her leg on the ski slope. Please dial 911.

17.The city (allow)..has allowed................residents to shoot off fireworks each year on July, 4^th

18.The lake (freeze)..has frozen.....solid. Now we can go skating

19. The sun (rise).has risen.....It's time to get up

20. The army (battle)..has battled.......the enemy for two weeks. The soldiers are exhausted

21. The principal (introduce) .has introduced......the new teacher. She seems very nice.

22. Using his telescope, An (see)..has seen...the new teacher. She seems very nice

23. The judge (listen) .has listened.... to all of the envidence. Now he will make a ruling

24. The strawberries (spoil) ..have spoilt..... They should have been kept in the refrigerator

25. He (write) .has written...a book about disease prevention. It'll be published soon

Tóm tắt :
Thùng thứ nhất : 28 , 6 lít
Thùng thứ hai : 25,4 lít
Thùng thứ ba :....? lít
Giải 
Thùng thứ ba có số lít dầu là :
       ( 28,6 + 25,4 ) : 2 = 27 ( lít )
            Đáp số : 27 lít
Rảnh k hộ !

thùng thứ 3 có số lít dầu là:

(28,6+25,4):2=27 lít

cả 3 thùng có số lít dầu là:

28.6+25,6+27=81

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