Tìm các số nguyên dương a,b để thoải mãn phương trình:\(a^2+b^2-13\left(a-b\right)=0\)

This is the first time I visit Paris.

1. If you (not water)....don't water...........the tree everyday, it (die)....will die......

2. if she(not pass)..isn't pass.........the exam, her parents(be)........will be.....Very worried.

3. If I find your passport, I (phone ) will phone.............you at once.

4. We (go out ) ........will go out......later if it (stop).........stop.....raining

5.Someone (steal)...will steal.......your car if you leave it unlocked.

6. If we(leave).are..leaving......now, we(not be).......will not be.................late

7. If she needs a radio, she (borrow) ..will borrow..............mine.

8.if he (read).....reads..........in bad light, he will ruin his eyes.

9. (you/ phone).....Will you phone.........me tomorrow if you (have)......have.......time?

10. Do you want to watch TV? - I (switch)......will..switch.....it on if you

11. If Tam (not apologise)............isn't apologise..........to me, I (not speak) .....won't speak........to him anymore

12. IF I (not be).......am not.........too busy tomorrow, I (visit)........will visit....... you

1.The lesson hasn't started yet.

2.The teacher has already written on the board.

3.Joe and Tim have just come into the classroom.

4.Tony hasn't finished getting the book ready.

5.Christine has already opened book.

6.Dave has dropped pen on the floor.

7.He hasn't picked it up yet.

1 % cua 100 là :

100 : 100 = 1

64% của 100 là :

1 * 64 = 64

Vậy 64% của 100 là 64

thay mau den

Hoàn thành các phương trình hóa học sau:

a) 5P + \(4O_2\)\(\rightarrow2P_2O_5\)

b) 3Fe + \(2O_2\rightarrow Fe_3O_4\)

c) Zn + \(2HCl\rightarrow ZnCl_2\)+ H2

d)2KClO_{3\(\rightarrow\)}2KCl + 3O₂

e) 2Al +\(3H_2SO_4\rightarrow\)\(Al_2\left(SO_4\right)_3+3H_2\)

f)CuO + \(CO\rightarrow Cu+CO_2\)

Phương trình a và b thêm nhiệt độ vào nhé cậu.

20 cái bắt tay đó bn

k cho mình vs nha!!

là con dốc