N*eNeZ

Đề sai ???!!!

a. 2,4,8,...,128

\(\Rightarrow\)128 - ( 2 x 4 x 8 )

\(\Rightarrow\)56

a. 2,4,8,56,128

b. 1,3,7,...,127

\(\Rightarrow\)127 - ( 1 x 3 x 7 )

\(\Rightarrow\)106

b. 1,3,7,106,127

đó là 2 nha

98764

1+1+55+66+77+2345

=2545

k mk nha

I. Complete the second sentence, using the word given in brackets so that it has a similar meaning to the first sentence.

1.John smoked cigarettes when he was a young man.

John used ........to smoke cigarettes when he was a young man..........

2.You will not be accepted if you don’t finish your homework

Unless .......you finish your homework, you will be accepted........

3.He’d rather play football than tennis.

He prefers ........playing football to tennis........

4.No one is more intelligent than her in our school.

She ........is the most intelligent in our school........

5.We find it difficult to understand this question.

This question ........is difficult for us to understand........

6.It’s nearly two years since we saw him.

We haven’t ........seen him for nearly two years.........

7.I go to school by bicycle in ten minutes.

It takes ........me ten minutes to go to school by bicycle.......

8.We spent a day cleaning the house.

It took .......us a day to clean the house.......

9.Finding out the answer to that question is not easy.

It’s .......not easy to find out the answer to that question........

10.Swimming in the river is dangerous

It’s ........dangerous to swim in the river........

11.We intend to play volleyball this weekend.

We are ..........going to play volleyball this weekend.........

12. My younger sister is fond of playing with her dolls.

My younger sister is keen .........on playing with her dolls........

13. We like reading books on history.

We are interested ........in reading books on history........

14. It is not necessary for you to do this exercise.

You don't .......need to do this exercise.......

15. How about going to the cinema with me tonight?

Would you like ........to go to the cinema with me tonight.......?

*Chỉ làm đến đó thôi nhá! Chị có vc bận rồi!*

x-1=1

x   =1+1

x    =2

100 k mk nha

nếu n chia hết cho 1 số chắc chắn n^2 chia hết cho số đó

mà n^2 chia hết thì chưa chắc n đã chia hết 

chỉ có một ước chung mà cả 2 cùng chia hết với mọi n đó là 1

vây n^2,n nguyên tố cùng nhau