Xét số 20217¹⁹⁹³ ta thấy 20217¹⁹⁹³=20217^4k+1=>20217¹⁹⁹³ có tận cùng là 7

Xét số 20213¹⁹⁹¹ ta thấy 20213¹⁹⁹¹=20213^4k+3=>20213¹⁹⁹¹ có tận cùng là 7

Mà ......7-.......7 có tận cùng là 0 =>M chia hết cho 5=>M có dạng 5k

=>ĐPCM

Viết các câu sau với các từ gợi ý dùng thì hiện tại đơn giản hoặc hiện tại tiếp diễn

1. Minh / go swimming / every afternoon

=>Minh goes swimming every afternoon.

2. My brothers /play /tennis / at the moment

=>My brothers are playing tennis at the moment.

3. I / read / an interesting novel

=>I am reading an interesting novel.

4. We / sometimes / play / marbles at recess

=>We sometimes play marbles at recess.

5. Some students / eat and drink / at this time

=>Some students are eating and drinking at this time.

6. My father / watch / the news on TV

=>My father are watching the news on TV.

7. Phong / play / computer games / in his free time

=>Phong plays computer games in his free time

8. The boy / swap / cards with his friend / now

=>The boy are swapping cards with his friend now.

Cho mk sửa câu 1 nhé

sau khi hỏi chị lại thì chị mk nói sai ở thì thôi,ko có dữ kiện j cho quá khứ đơn nên ta chia hiện tại đơn thôi:))

1.Students from different 14 schools participated in the competition.

___________=>participate

nếu có key cho mk xin vs nhé,thank you ^^

Find mistake :))

1.Students from different 14 schools participated in the competition.

___________=>14 different (câu này tìm mãi chả hiểu sai ở đâu,nên nghĩ nó sai ở chỗ này bạn nhes^^)

2.We'll wait here until he will come back tomorrow.

_________=>__comes

3.The new machine works much more fastly than the old one.

_____________=>faster

4.It rained so hard for us to go camping.

____________=>too

5.A friend of him got married to a Chinese girl last week.

______________=>his

6.The wind started to blow and the rain became more heavily.

______________=>heavier

7.I'm glad that the number of participants increase every week.

_____________=>increases

8.They don't go to school on Sunday and I don't neither.

____________=>either

9.It's fact that go jogging is a good way to keep fit.

____________=>going

10.I'd like to buy 2 dozens of pencils, please

=>dozen

1. Nothing (do)…has been done……since I moved here.

2. Where would you (go)…go……………………if you had a lot of money?

3. It (not rain)……doesn't rain……………….much in our country in winter.

4. Who (carry)……………will carry………..our bag when we climb the mountain?

5. Did you advise her (join)…to join……………..in the talent contest?

6. He had a bad fall while he (repair)…was repairing………his roof.

7. They can’t go out now because it (rain)…is raining……… and they (not have) …don't have………….

……. a raincoat.

chia động từ trong ngoặc số ít hoặc số nhiều

1 the causes of this disease (be) poor diet and lack of exercise

=>are

2 the noise from the neighbor (make)me annoyed=>makes

3 the members of the committee (be) very excited=>are

4 our group (meet)in a famous restaurant=>meets

5 a piece of paper (be) on the table=>is

6 there (be)only one way i can answer your question :yes,i will marry you=>is

7 our swimming club (compete)on monday=>competes

8 the numbers of members in our group (reach)17=>is