II.Rewrite the sentences in such a suggested way that the new ones still keep the same meaning
as the old ones.
23. Van Cao composed Viet Nam’s anthem  “Tien Quan Ca”
 Viet Nam’s anthem “Tien Quan Ca”…was composed by Van Cao……………………………
24. Tell me the number of tomatoes you want.
 How many …tomatoes do you want……………………………………………………?
25. When did you learn English?
How long…have you learned English…………………………………………………..?

23. Viet Nam's anthem "Tien Quan Ca" was composed by Van Cao.

24. How many yomatoes do you want?

25. How long have you learnt English?

Hình ảnh được vẽ lại bởi họa sĩ siêu tài năng về mảng chém gió Cái thang 3m Tường 2,8m Tính cái này A B C

Gọi ví trí chân tường là C, chân thang là B, đỉnh thang chạm vào tường là A

Vì chân  tường vuông góc với mặt đất \(\Rightarrow AC\perp BC\)

Áp dụng định lí Py-ta-go trong tam giác ABC ( \(AC\perp BC\)) ta có :

\(AB^2=AC^2+BC^2\Rightarrow3^2=2,8^2+BC^2\Rightarrow BC^2=9-7,84=1,16\)

\(\Rightarrow BC=\sqrt{1,16}\)( m )

Thật ra cái này tớ cũng không chắc lắm !

~Cảm ơn pạn nhìu lém!!!~               *~Arigatou Gozaimasu~*

In Vietnamese have many drink but i most is water. It don't have color, taste, smell but it very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very ery very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very very good.

Chúc bạn học tốt !  👍👍👍👍👍👍👍👍👍👍👍👍👍

được không bạn

• lacnguyet
• 25/03/2020

Tác dụng: Nhấn mạnh lí do vì sao mà nhân vật "tôi" lại " làm điệu dún dẩy các khoeo chân, rung lên rung xuống hai chiếc râu"

\(\frac{1}{x}-\frac{1}{y}=\frac{1}{x}.\frac{1}{y}\)

\(=>\frac{y-x}{xy}=\frac{1}{xy}\)

\(=>xy^2-x^2y=xy\)

\(=>xy^2-x^2y-xy=0\)

\(=>x.\left(y^2-xy-y\right)=0\)

\(=>\orbr{\begin{cases}x=0\\y^2-xy-y=0\end{cases}}\)

Ta thấy \(y^2-xy-y=0\)

\(=>y.\left(y-x-y\right)=0\)

\(=>\orbr{\begin{cases}y=0\left(2\right)\\y-y=0\end{cases}}\)

Từ 1 và 2 => x = y = 0

\(\frac{1}{x}-\frac{1}{y}=\frac{1}{x}.\frac{1}{y}\)

\(\Rightarrow\frac{y-x}{xy}=\frac{1}{xy}\)

\(\Rightarrow y-x=1\)

Vậy x,y có dạng \(\hept{\begin{cases}x=y-1\\y=x+1\end{cases}}\)với \(y\ne1;x\ne-1;x\ne0;y\ne0\)