nhút nhát

a)2829:x=23 
-->        x=2829:23
-->        x=123

b)12209:x=29
-->          x=12209:29
-->          x=421

Hòa tan 37,2 gam hỗn hợp A gồm Zn và Fe trong 2 lít dung dịch H₂SO₄ loãng, có nồng độ 0,5M.

a) Chứng minh rằng hỗn hợp A tan hết?

b) Nếu hòa tan hỗn hợp A có khối lượng gấp đôi ở trên vào lượng dung dịch axit như trên thì hỗn hợp này có tan hết hay không?

1. He will be punished.
2. My office is being painted today.
3. The work has just been done.
4. This camera was bought in Japan.
5. My daughter was taken far away from me.
6. I was being eaten alive by the mosquitoes.
7. Many promises had been made.
8. The new bridge will have been completed by March.
9. I am going to be arrested.
10. This novel was written by an American writer.
11. The mail had been delivered in the morning.
12. The cause of the accident was being investigated by the police.
13. The meeting will be held tomorrow.
14. He was seen crossing the road.
15. The sculpture has been lost.
16. Is lunch included in the price?
17. Tom is going to be cut from the team.
18. A new bridge is being built over the river.
19. Our offer would be accepted by Tom.
20. Your watch has been found.
21. This work can be done within a week.
22. His house was sold for ten thousand pounds.
23. You should have been expelled.
24. The problem is being discussed.
25. Mary was being followed

Thể tích của một khối gỗ là :
   6 x 6 x 6 = 216 (dm3)
Khối lượng của một khối gỗ là :
   216 x 2 = 432 (kg)
Khối lượng 5 khối gỗ là :
   432 x 5 = 2160 (kg) = 2,16 tấn < 4 tấn
Vậy xe có thể chở cùng lúc 5 khối gỗ đó.

A

1. Unless you study harder, you'll get bad marks.
2. If this man isn't a driver, he can't help you move by car.
3. Unless he practices writing every day, he can't improve his writing skill.
4. If the student doesn't go to school early, he will be punished.
5. If you don't try your best, you can't run fast.
6. Unless you leave me alone, I'll call the police.
7. Unless the weather is bad, we will go.

 

B

1,2+(-1)=0,2