125-5.(3x-1)=25

      -5.(3x-1)=-100

            3x+1=20

            3x    =19

              x    =19/3

1.This question is not difficult. Who          volunteer            ?  (voluntary)

2. We            beautify           our garden by planting trees and flowers. (beautiful)

3. Suddenly, I woke up and the thief         appeared        . (appear)

4. The police are interested in the sudden          appearing              of the valuable paintings. (appear)

Put the verbs in brackets in the correct tense form

1.  - Where ........are... you (be) .............., Phong?

     - I'm upstairs. I (do) .......doing......... my homework.

2.  - It's warm today. I (not want) ........don't want......... (stay) ......to stay....... at home now. What about (go) ....going..... swimming in the river?

Peter's family live in a small apartment OVERlooking the sea.

Along with jogging and swimming, cycling is the best all-round forms of exercise. It can help to increase your strength and energy, giving you a stronger heart. You don't carry the weight of your body on your feet when cycling. It is also a good form for people with a pain in your feet or your back. You should start your hobby slowly. Doing too quickly-can have bad effects.

You should cycle twice or three times a week. If you find you are in pain, you will stop and take a rest.

1. Why is cycling a good form of exercise?

It can help to increase your strength and energy, giving you a stronger heart.

2. Why might people with a pain in the back go cycling ?

You don't carry the weight of your body on your feet when cycling.

3. what will happen if you do too quickly ?

Bad effects.

4. How often should you go cycling ?

You should cycle twice or three times a week.

5. What will you do if you find you are in pain ?

If you find you are in pain, you will stop and take a rest.

ciao ciao 

Coin collecting is one of the most popular hobbies in the world. Most coin (1) .... enjoy trying to have a complete set of a country's coin.s. some people collect coins for pleasure : (2) ..... collect coins in order to sell them later. From coins, we also  (3) ...... something about certain famous people and events in a country's (4) ....... Many beginning collector go to the bank and buy coins. Then they (5) ..... coins for their collection.

1. A. collectors       B. collecting       C. collected         D. collections

2. A. another       B. other       C. others         D. the other

3. A. teach       B. learn       C. give         D. offer

4. A. history       B. nature       C. science         D. geography

5. A. look       B. see       C. watch         D. find

Coin collecting is one of the most popular hobbies in the world. Most coin (1) .... enjoy trying to have a complete set of a country's coin.s. some people collect coins for pleasure : (2) ..... collect coins in order to sell them later. From coins, we also  (3) ...... something about certain famous people and events in a country's (4) ....... Many beginning collector go to the bank and buy coins. Then they (5) ..... coins for their collection.

1. A. collectors       B. collecting       C. collected         D. collections

2. A. another       B. other       C. others         D. the other

3. A. teach       B. learn       C. give         D. offer

4. A. history       B. nature       C. science         D. geography

5. A. look       B. see       C. watch         D. find

1. Tìm x€Q, biết
a) | x-5|=2x+3

\(=>\left[\begin{array}{nghiempt}x-5=2x+3\\x-5=-2x-3\end{array}\right.\)

\(=>\left[\begin{array}{nghiempt}x=-8\\x=\frac{2}{3}\end{array}\right.\)
b) 3-|3x+1|=-6

\(=>\left[\begin{array}{nghiempt}3x+1=9\\3x+1=-9\end{array}\right.\)

\(=>\left[\begin{array}{nghiempt}x=\frac{8}{3}\\x=\frac{10}{3}\end{array}\right.\)
2. Tìm a€Z, biết
a) |a+8|<1

=> Ia+8I = 0 => a+8 = 0 => a = -8
b) |3a+4|<3

\(=>\left[\begin{array}{nghiempt}\left|3a+4\right|=0\\\left|3a+4\right|=1\\\left|3a+4\right|=2\end{array}\right.\)

\(=>\left[\begin{array}{nghiempt}a=-\frac{4}{3}\\\left[\begin{array}{nghiempt}3a+4=1\\3a+4=-1\end{array}\right.\\\left[\begin{array}{nghiempt}3a+a=2\\3a+4=-2\end{array}\right.\end{array}\right.\)

\(=>a=-\frac{4}{3};a=-1;a=-\frac{5}{3};a=-\frac{2}{3};a=-2\)

theo đầu bài a ϵ Z => a= -1; a=-2 thỏa mãn

Vậy a= -1 

hoặc a=-2