Prevention

Robots at home will help people with household chores.

Will your future house be in space?

1, One of the traffic problems in our big cities is that there are too many people using the road.

2, Don't drive if you feel tired or after drinking alcohol.

3, How far is it from your house to the Youth club?

4, The traffic can be a nightmare for visitors to Viet Nam for the first time.

5, There are transport rules, but many people don't seem really interested in following them.

6, The traffic is worst during rush hours when everyone try to get to work and get home quickly.

7, Some people ride their motorbikes on the pavements would rather than wait a traffic jam.

8, Some people install air horn on their motorbikes, this is really annoying for other people and sometimes it causes accidents.

9, Another problem is the increase in the number of cars on the road.

10, More people have their own private cars and it makes the problem of the traffic jams worse.

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3. Fred will be angry if Jack arrives late again.

4. I will come to your house if I have enough time.

5. If she doesn't pass this exam, she won't get the job that she wants.

6. You will learn a lot if you take this course.

7. If I get a ticket, I will go to the cinema.

8. I will buy that machine if it doesn't cost too much.

9. If you run very fast, you will catch the taxi.

10. I will go to the doctor's if I don't feel better tomorrow.

11. If they win this match, they will be the champions.  

\(a\))\(Ta\) \(có\):

    \(A=\dfrac{\left(x+2\right)^2}{x}\left(1-\dfrac{x^2}{x+2}\right)\)  với \(x\ne0,x\ne-2\)

⇔\(A=\dfrac{\left(x+2\right)^2}{x}-x\left(x+2\right)\)

⇔\(A=\dfrac{\left(x+2\right)^2-x^2\left(x+2\right)}{x}\)

⇔\(A=\dfrac{\left(x+2\right)\left(-x^2+x+2\right)}{x}\)

⇔\(A=\dfrac{\left(x+2\right)\left(2-x\right)\left(x+1\right)}{x}\)

Vậy...

\(a\))\(2,9+3,7+\left(-4,2\right)+\left(-2,9\right)+4,2\)

\(=3,7\)

\(b\))\(\left(-6,5\right).2,8+2,8.\left(-3,5\right)\)

\(=2,8.\left(-6,5-3,5\right)\)

\(=2,8.\left(-10\right)\)

\(=-28\)

\(c\))\(\left(-6,37.0,4\right).2,5\)

\(=\left(-6,37\right).\left(0,4.2,5\right)\)

\(=-6,37\)

\(d\))\(\left(-0,125\right).\left(-5,3\right).8\)

\(=\left(-5,3\right).\left(-1\right)\)

\(=5,3\)