My mother:

My mom is my important people in the life. She is a teacher in a big school. She teaches Literature. She is 38 years old. She is tall and strong. She has a good shape. She has an oval face with a long black hair. She has a delicate nose in front of the red full lips. Her eyes are black and affectionate. Her ears are big. Her hands are white. Outside, she isn’t beautiful than others, but in my eyes, she is the most beautiful. She cooks delicious food and very great. I love her food. It countains feeling for my mother. My mother also looks after me when I am a kid. My mom always teaches me Literature in the evenings. My mom usually kind and easy going with everyone. And she always smile. She is very kind with my family so I love her very much. Because love her so I will learn very good for her often happy and has many fun.

1.''If I were you,I would study harder,''he said to me.

->He advised me to study harder.

2.His car can't run as fast as mine.

->My car runs faster than his car.

3.The picture was so high that the little boy couldn't tough it.

->The picture was high enough that the little boy couldn't tough it.

4.The deer doesn't eat meat and hippopotamus doesn't eat meat either.

->Neither the deer nor hippopotamus eats meat.

5.Reading scientific books in my interest.

->I am interested in reading scientific books.

6.He can't get the job because he isn't good at English.

->If he was good at English, he could get the job.

7.''Which one do you want,the blue or the green one?''John said to her.

->John asked her whether she wanted, the blue or the green one.

1. My grandfather / grow / flowers / his garden.

-> My grandfather is growing flowers in his garden.

2. There / too many vehicles / to much noise / Ha Noi City.

-> There are too many vehicles and too much noise in Ha Noi city.

3. Don't / any empty cans / street.

-> Don't throw any empty cans in the street.

4. What / we do / save / our Earth ?

-> What should we do to save our Earth?

5. Which / floor / your class ?

-> Which floor is in your class?

1. Alcohol is bad for you and so are cigarettes.

Both..alcohol and cigarettes are bad for you.....

2. He didn’t hurry, so he missed the bus.

If....he was hurry, he wouldn't miss the bus...

\(A=\dfrac{x^2+4x+4}{x}\)

\(A=x+4+\dfrac{4}{x}\)

\(A=\left(x+\dfrac{4}{x}\right)+4\)

Áp dụng bất đẳng thức Cô - si, ta có :

A \(\ge2\sqrt{x.\dfrac{4}{x}}+4\)

\(\Leftrightarrow\)\(A\ge6\)

=> Min A = 6 khi \(x=\dfrac{4}{x}\Leftrightarrow x^2=4\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

Vậy GTNN của A = 6 khi \(\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)

100 con ếch và 100 con cua

A = \(x^2-3x+5\)

A = \(x^2-2.x.\dfrac{3}{2}+\dfrac{9}{4}+\dfrac{11}{4}\)

A = \(\left(x-\dfrac{3}{2}\right)^2+\dfrac{11}{4}\ge\dfrac{11}{4}\)

=> Min A = \(\dfrac{11}{4}\) khi \(x-\dfrac{3}{2}=0\)

\(\Leftrightarrow x=\dfrac{3}{2}\)

Vậy GTNN của A = \(\dfrac{11}{4}\) khi \(x=\dfrac{3}{2}\)

\(D=4x-\sqrt{9x^2-12x+4}\)

\(D=4x-\sqrt{\left(3x-2\right)^2}\)

\(D=4x-\) /3x - 2 /

* 3x - 2 \(\ge0\) \(\Leftrightarrow3x\ge2\Leftrightarrow x\ge\dfrac{2}{3}\)

=> D = 4x - 3x +2 = x + 2

* 3x - 2 \(\le0\Leftrightarrow3x\le2\Leftrightarrow x\le\dfrac{2}{3}\)

=> D = 4x + 3x - 2 = 7x - 2

Vậy \(\left[{}\begin{matrix}D=x+2\\D=7x-2\end{matrix}\right.\)