1. My father is older than my mother.
2. There is a sink, a fridge, a cooker and a cupboard in our kitchen.
3. There are five rooms in my house.
4. You shouldn't spend a lot of time watching TV.
5. You must do your homework before going to school.

1. \(P=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\left(\dfrac{3\sqrt{x}+1}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+3\right)}-\dfrac{2}{\sqrt{x}+3}\right)\)

\(P=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\left(\dfrac{3\sqrt{x}+1-2\left(\sqrt{x}-1\right)}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+3\right)}\right)\)

\(P=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\left(\dfrac{3\sqrt{x}+1-2\sqrt{x}+2}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+3\right)}\right)\)

\(P=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\left(\dfrac{\sqrt{x}+3}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+3\right)}\right)\)

\(P=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}.\sqrt{x}-1\)

P=\(\sqrt{x}+4\)

b)  \(P=\dfrac{x}{4}+5\)

⇔\(\sqrt{x}+4=\dfrac{x}{4}+5\)

⇔\(\dfrac{x}{4}-\sqrt{x}+1=0\)

⇔\(x-4\sqrt{x}+4=0\)

⇔\(\left(\sqrt{x}-2\right)^2=0\)

⇔\(\sqrt{x}-2=0\)

⇔\(\sqrt{x}=2\)

⇔\(x=4\) 

Vậy x=4 thì P=\(\dfrac{x}{4}+5\)

Bài 1: 

a) Ta có: \(P=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\left(\dfrac{3\sqrt{x}+1}{x+2\sqrt{x}-3}-\dfrac{2}{\sqrt{x}+3}\right)\)

\(=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\left(\dfrac{3\sqrt{x}+1}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}-\dfrac{2\left(\sqrt{x}-1\right)}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}\right)\)

\(=\dfrac{\sqrt{x}+4}{\sqrt{x}-1}:\dfrac{\sqrt{x}+3}{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}\)

\(=\sqrt{x}+4\)

b) Ta có: \(P=\dfrac{x}{4}+5\)

\(\Leftrightarrow\sqrt{x}+4=\dfrac{1}{4}x+5\)

\(\Leftrightarrow\dfrac{1}{4}x-\sqrt{x}+1=0\)

\(\Leftrightarrow x-4\sqrt{x}+4=0\)

\(\Leftrightarrow x=4\)

giãn ra

Bài 4: 

Nhóm 1: x;1/3x; 8x

Nhóm 2: \(x^2;5x^2;-3x^2\)

\(=\dfrac{7}{20}-\dfrac{1}{4}=\dfrac{7}{20}-\dfrac{5}{20}=\dfrac{1}{10}\)

\(\dfrac{7}{20}+\dfrac{-1}{4}=\dfrac{7}{20}+\dfrac{-5}{20}=\dfrac{2}{20}=\dfrac{1}{10}\)

=1/10

Bạn ơi bạn chịu khó gõ tay đi chứ nhìn hình......

Tần số là số lần dao động của vật trong 1s. Đơn vị Hz

Tần số dao động của vật thứ nhất là: 700:10=70H

Tần số dao động của vật thứ hai là: 9000:300=30Hz

Vật 2 dao động âm chậm hơn và vật 1 phát ra âm cao hơn. Vì tần số dao động của vật 1 > vật 2

uses crt;

var a:array[1..100]of integer;

i,n,t:integer;

begin

clrscr;

write('Nhap n='); readln(n);

for i:=1 to n do 

begin

write('A[',i,']='); readln(a[i]);

end;

t:=0;

for i:=1 to n do 

  if a[i] mod 2<>0 then t:=t+a[i];

writeln('Tong cac phan tu le la: ',t);

readln;

end.

My hobby is watching films. I have seen many films. The film I best is Chang Trai Nam Ay. It's comedy moving, which was directed by Quang Huy. It's stars Son Tung M-TP, Hariwon, Hua Vi Van, Ngo Kien Huy and Pham Quynh Anh. The film was made in 2014.
Chang Trai Nam Ay is very hilarious, roman and moving. It's about the young singer who has a cancer. The story of film is based on the real. The ending is very moving, I cried. I love Dinh Phong (by Son Tung) very much.
The special effects and the visuals are good. The music has sweet melody. I the acting very much. The actors play very well. Those are the reasons why I Chang Trai Nam Ay. The cris say it is a good film. I agree, although the film has a lot of scandals and bad comment from some viewers.

'My hobby is watching films. I have seen many films. The film I best is Chang Trai Nam Ay. It's comedy moving, which was directed by Quang Huy. It's stars Son Tung M-TP, Hariwon, Hua Vi Van, Ngo Kien Huy and Pham Quynh Anh. The film was made in 2014.
Chang Trai Nam Ay is very hilarious, roman and moving. It's about the young singer who has a cancer. The story of film is based on the real. The ending is very moving, I cried. I love Dinh Phong (by Son Tung) very much.
The special effects and the visuals are good. The music has sweet melody. I the acting very much. The actors play very well. Those are the reasons why I Chang Trai Nam Ay. The cris say it is a good film. I agree, although the film has a lot of scandals and bad comment from some viewers.'' 

I really the film Forrest Gump. It is a roman comedy with the acting of Tom Hanks.

It’s about the life of a stupid ugly man, Forrest and his love for a neighbor girl, Jenny. The film is moving and hilarious. The ending is happy, because they have good life and a son.

The acting of two characters is very good. The music is interesting and suitable for film content. The visuals are beautiful with scenery of countryside, crowded cites in USA.

Cris say that the film is the best film with moving scenes and meaningful messages.

I think that the film is so wonderful from actor, actress to visual, music.