var i, so: integer;

begin
  writeln('Nhap vao 10 so tu nhien:');
  for i := 1 to 10 do
  begin
    write('So thu ', i, ': ');
    readln(so);
    writeln('So vua nhap la: ', so);
  end;
  readln;
end.

`sqrt(20)-sqrt(21-4sqrt5)=2\sqrt5-sqrt((2\sqrt5)^2-2.2sqrt5 .1+1^2)=2\sqrt5-sqrt((2sqrt5-1)^2)=2sqrt5-2sqrt5+1=1`

My father often gets up so early in the morning.

I like watching films but my younger sister does not like films. She prefers playing the piano.

Bob: What are you doing?

An: I am preparing tea for Dad. Do you want some, Bob?

Kim: What colour are they painting the doors now?

Sam: It's green.

Long: Does she drive to work on her own?

Tuan: No. Her husband drives her to work.

Her mother is in hospital. Lia wishes her mother could get better soon.

My laptop got broken this morning and I don't have it until tomorrow morning.

Chứng mình gì ạ?

`24=2^3 .3`

Ta có: `680=2^3 .5.17;24=2^3.3`

`=>gcd(680;24)=2^3=8`

Nhưu vậy viên gạch hình vuông lớn nhất có cạnh là `8cm`

1. We prepare our houses and clean food for traditional Tet.

(Chúng tôi chuẩn bị nhà cửa và thực phẩm sạch cho Tết.)

2. Is there anything special people should do at Tet?

(Có điều gì đặc biệt mọi người nên làm vào dịp Tết không?)

16. Would you mind if I used your mobile phone?
17. Do you mind carrying my luggage?
18. Would you mind not using the office phone for personal calls?
19. It's important to keep the environment clean.
20. Would you mind turning down the TV, please?

bạn bổ sung thêm đi ạ, với bạn nhầm dấu r

`a,` ĐKXĐ: `x>=0;x\ne1`

`A=...=(sqrtx(1+sqrtx)+sqrtx(1-sqrtx)+sqrtx-3)/((1-sqrtx)(1+sqrtx))`

`=(sqrtx+x+sqrtx-x+sqrtx-3)/((1-sqrtx)(1+sqrtx))`

`=(3sqrtx-3)/((1-sqrtx)(1+sqrtx))`

`=-3/(1+sqrtx)`

`b,A=-3/(1+sqrtx)` 

Vì `x>=0` nên `1+sqrtx>=1` nên `3/(1+sqrtx)<=3` suy ra `A>=-3`

Dấu "=" xảy ra `<=>x=0`

Vậy `A_(min)=-3<=>x=0`