đề là điền giới từ pk 

19A

20A

14.a.7x+21=0

⇔7x=-21 ⇔ x=-3

b.5x-2=0

⇔5x=2

⇔x=\(\dfrac{2}{5}\)

c.12-6x=0

⇔6x=12

⇔x=2

d.-2x+14=0

⇔-2x=-14

⇔x=7

0

D

khỏe mạnh, lực lưỡng, cường tráng

These days __________________ ( much/ many) people value their free time and want to do as __________________ ( much/ many) things as possible in it. There are __________________  (much/ many) different activities that people enjoy doing. __________________ ( Most/ Much) young people do sports. __________________ (Much/ Many) of them do popular sports like running, swimming, tennis or football. __________________ ( A few/ a little) people do unsual sports like parachuting. Sport doesn’t have to cost a lot. __________________ ( Little/ Few) money is needed for a game on the beach, and a lovely walk in the park costs perhaps the __________________ (least/ most)! _________________ ( A few/ A little) time spent outside doing sport is very good for your health, too. But __________________ ( any/ some) people don’t like sport. Instead, they do different cultural activities in their free time. Visiting museums, reading or going to the theatre are a few examples of what people can do in their free time. Do you have any favorite hobbies?

I .Read. Choose the correct sentence.

1.Câu hỏi

Steven gave me some good advice.

2.Câu hỏi

Sid has wasted a lot of time on computer games.

3.

There is much work for us to do.

4.Câu hỏi

You may buy as many books as you wish.

5.Câu hỏi

Nowadays, John does not eat much.

6.

There is too much rubbish here..

7.Câu hỏi

The monitor has done much for the class.

8.

There are some geese swimming in the pond.

9.Câu hỏi

He worked more than any of us.

10.

There is too much noise there.

11.Câu hỏi

As grow older, we sleep less.

12.Câu hỏi

Many types of flowers are found here.

quan trọng, hữu dụng nha