\(x\left(2x-7\right)-4x+14=0\)

\(\Leftrightarrow x\left(2x-7\right)-\left(4x-14\right)=0\)

\(\Leftrightarrow x\left(2x-7\right)-2\left(2x-7\right)=0\)

\(\Leftrightarrow\left(2x-7\right)\left(x-2\right)=0\)

\(\Leftrightarrow\left[\begin{matrix}2x-7=0\\x-2=0\end{matrix}\right.\) \(\Leftrightarrow\left[\begin{matrix}x=\frac{7}{2}\\x=2\end{matrix}\right.\)

Vậy phương trình có tập nghiệm là \(S=\left\{\frac{7}{2};2\right\}\)

Don't forget to buy me a dictionary,__________?

A. do you

B. will you

C. shall you

D. don't you

1. I saw the men, the women and the cattle which wen to the field.

A B C D

2. Look at the two dictionarys and you will see they are the same in some ways.

A B C D

3. She did her test carefull last week.

A B C D

4. Would you mind turn on the lights, please? It's too dark for me to read.

A B C D

\(i=\frac{Z_1}{Z_2}=\frac{50}{20}=2,5\)

\(\Rightarrow n_2=n_1\begin{matrix}\cdot&\frac{Z_1}{Z_2}=2,5.n_1\end{matrix}\)