Dear Dane,

How are you ? I'm fine. I'm in London, at the International School of English. I'm in class 7B with eight other students. They are all from different countries- Spain, France, Japan, Argentina, Switzerland and Thailand. Our teacher's name is John Smith. He is very nice. He is funny and he is very good teacher. My new address is at the top of the letter. I live with an English family, the Browns. Mr and Mrs Brown have three children. Thomas is fourteen, Catherine is twelve and Andrew is seven. They are all friendly but it isn't easy to understand them !

Write to me soon.

Love,

Jane

Emperor Ly Thanh Tong founded The Temple of Literature in 1070. Now it is considered as one of the historic and cultural sites of Vietnam. And then in 1076 Emperor Ly Nhan Tong built The Imperial Academy as the first university of Vietnam.

In 1484, Emperor Le Thanh Tong built the first Doctor’s stone tablet there to memorize the devotion of Doctors. Now it is recognized as the World heritage by UNESCO. In 2003, the Ha Noi People Committee built four statues of Emperor Ly Thanh Tong, Emperor Ly Nhan Tong, King Le Thanh Tong, and Chu Van An who founded and developed Temple of Literature - Imperial Academy.

Cho a gam axit glutamic tác dụng với NaOH vừa đủ cô cạn thu được (a + 8,8)g chất rắn. Nếu cho a gam axit glutamic tác dụng vừa đủ với dung dịch HCl, khối lượng HCl cần dùng là

A. 7,3g

B. 14,6g

C. 29,2g

D. 58,4g

Gọi số máy của 3 đội lần lượt là a, b, c (máy) (a,b,c thuộc N*)

Theo đề bài ta có :

4a = 6b = 8c

\(\Rightarrow\frac{4a}{24}=\frac{6b}{24}=\frac{8c}{24}\)

\(\Rightarrow\frac{a}{6}=\frac{b}{4}=\frac{c}{3}\)

Áp dụng tính chất của dãy tỉ số bằng nhau ta có :

\(\frac{a}{6}=\frac{b}{4}=\frac{c}{3}=\frac{a-b}{6-4}=\frac{2}{2}=1\)

\(\Rightarrow\begin{cases}a=1.6=6\\b=1.4=4\\c=1.3=3\end{cases}\)

Vậy số máy của 3 đội lần lượt là 6 máy. 4 máy, 3 máy

sau 1,5h an đi được là :

​​12* 1,5 = 18 (km)

quãng đường AB dài là:

18+7=25(km)