tìm x : |3x-5| = |x+2|

tìm giá trị nhỏ nhất : A= |x-2| + |5-x|

tính hợp lí :

\(\frac{-1}{90}-\frac{1}{72}-\frac{1}{56}-\frac{1}{42}-\frac{1}{30}-\frac{1}{20}-\frac{1}{12}-\frac{1}{6}-\frac{1}{2}\)

tìm x : a, |3x-2|+5x = 4x-10 b, 3 + | 2x+ 5 | >13

Tìm x biết:

a) |4x+3|-x=15

b) |3x-2|-x>1

c) |2x+3|5

0 câu trả lời

write the sentences, using the adjective + to - infinitive structure :

1. Your old friends / surprised / see / you / again / after a long time

2.It / not safe / drink / water / the river / directly

Rewrite the following sentences, using phrase of purpose.

1. Leave aerly so that you may get home before dark. ( to do sth)

2. This man changed his address constantly so that he could void the police.( to do sth)

3. I shouted in order that I cuold warn everyone of danger. ( in order to do sth )

4. Banks are developed so that they can keep people's money safe. ( to do sth )

5. Mary went to the library in order to that she could borrow some books. ( so as to do sth )

6. Yesterday father went to the bank so that he would open a checking account. ( so as to so sth )

7. I went to see him so that I could find out what had happened. ( in order to sth )

8. Tom is saving up so that he can buy a new bicycle. ( to do sth )

9. He hurried so that he could catch the train. ( to do sth)

10. She is learning French so that she will be able to speak it when she comes to Paris. ( to do sth )

Comment on what each person says. Use the word in brackets.

1. Claude : I study encyclopesias. Then I can answer quiz questions ( so that )

2.Vicky : I'm saving up. I'm planning a holiday (for)

3.Nick ; I keep a dog . It guards the house ( to)

4. Olivia : I booked a babysitter. I wanted to go out for the evening ( so that )

5. Jessica : I'm going on a diet . I want to lose weight ( in order to )

6.Trevor : I often switch off the heating. It saves money ( to)

7.Sarah : I had to go to Birmingham. I had a business meeting (for)

8. Emma : I wore boots because I didn't want my feet to get wet ( so that)

9.Mark : I'm saving my money. I'm planning to travel in Europa next summer ( In order to )

Thu gon :

a, 2x * (x-1)-3x * (x+1)

b, (x-1) * (x+2) - (x-2) * (x+1)

c, (x-1)^2 - (x+2)^2

d, (2x-1) * (2x-1) -4 ( x+1)^2