Bài 1:Chứng tỏ rằng:
a; [n.13].[n + 20] chia hết cho 2
b; [2.n + 5].[12.n + 7] không chia hết cho 2
c; Nếu cd chia hết cho 4 thi abcd cũng chia hết cho 4
d; abba chia hết cho 11

Bài 2 :Có hay không 2 số tự nhiên x và y thỏa mãn:
[x + y].[x - y] = 2018

Kí hiệu : . = dấu nhân

Giúp mik với

So sánh:

2009 . 2010 + 2000 và 2011 . 2010 - 4036

Kí hiệu: . = dấu nhân

So sánh:

2009 . 2010 + 2000 và 2011 . 2010 - 4036

Kí hiệu: . = dấu nhân

Giúp mik nha mai phải nộp bài rùi

So sánh:

2009 . 2010 + 2000 và 2011 . 2010 - 4036

Kí hiệu: . = dấu nhân

Giúp mik nha mai phải nộp bài rùi

Tìm 1 từ thừa trong mỗi dòng

David lives in the countryside in the Canada.He

usually gets up too early and does morning exercise with

his bike.He rides around his area.After the breakfast, he

takes by a bus to school.He has lessons from 9.00a.m to 1.00p.m.

He is often has lunch in the school canteen and then he has

a short rest.In the afternoon,he has many lessons in the

library or P.E in the gym.After the school,he often goes to

the sports center near and plays a basketball or

tables tennis.In the evening,he often does much his

homework.Sometimes he surfs on the internet for his

school projects .He often goes to the bed early.

Tìm từ và sữa lỗi sai trong mỗi câu

1.My brother doesn't like durians , but I don't like them, either

2. She goes to see the doctor at his office and she is ill

3. There isn't some rice in the jar

4. They listen to me carefully but they don't understand I

5. My parents always go to jogging in the morning

6. How do you go to see the dentist ? Once or twice a month

7. There are a teacher and twenty students in the classroom

8. There is a lot of rain on the summer

10. She buys him some new pencil

II. Dùng từ gợi ý để viết thành câu hoàn chỉnh:

1. What time / he / finish his class / morning ?

2. He always / go / bed / 10.30 after he / finish his homework

3. You / listen to music / evening ?

4. How many / teacher / your school / have ?

5. Mr Hung / be / engineer / ./ He / get up / five / and / brush his teeth

6. What time / you / your family / breakfast ?

7. How / she / travel / work / the moment ?

8. There / be many accidents / this road because there / be a lot of traffic

9. My brother/ live / Ha nam and / he / have / bookstore there

10. The boys/ swim / the river / his friends now

Ngày 19 - 8 - 2002 vào ngày thứ hai. Tính xem ngày 19 - 8 - 1945 vào ngày nào trong tuần ? Và ngày 19 - 8 - 2018 vào ngày nào trong tuần ?