1.
3A= 3(3+32+ ...+ 32017)
3A= 32 + 33 + .... + 32018
Lấy 3A - A = (32 + 33 +...+ 32018) - (3+32+...+32017)
2A = 32018 - 3
2A+3 = 32018 - 3 +3 = 32018
=> 2A+3 là một lũy thừa của 3
Tìm số tự nhiên a khác 0 nhỏ nhất biết:
3) a chia cho 4 ; 6 ; 8 có số dư lần lượt là 2 ; 4 ; 6
2. Tìm lỗi sai ở những câu sau và sửa lại cho đúng.
1. She am tall.
2. I are Minh.
3. We am fine, thank you.
4. They is cats.
5. Peter are a student.
6. We is students.
7. They is my friends.
8. Here are my book.
9. Tom are my friend.
3. Fill in the blank with suitable form of present verb of TO BE:
1. Today ............ Monday. I .............. at school.
2. Mom and Dad ………………..at home. They .............. at the hospital.
3. The weather……………… nice. It ................. windy and rainy.
4. ……… he free all day?
5. She…………….tired.
6. I…………… in London.
7. ………you at Nina’s house?
8. I…………with him.
9. …………..they happy?
10. He………… at school. He is at home.
11. ........... you busy today? - Yes, I……………
12. ………. it cold? - No, it…………….
13. Where…………… they on Sunday? - They…………. at the store.
14. …………Nina and Sam strong? - No, they………………
15. ………….Sam ill? - Yes, she…………………
4. Fill in the blank with suitable form of past verb of TO BE:
1. Yesterday ........ Monday. I ....... at school.
2. Mom and Dad ………………..at home yesterday. They were at the hospital.
3. The weather……………… nice. It was windy and rainy.
4. ……… he free all day yesterday?
5. She…………….tired last night.
6. I…………… in London last month.
7. ………you at Nina’s house yesterday?
8. I…………with him yesterday.
9. …………..they happy last week?
10. He………… at school. He was at home.
11. Were you busy yesterday? - Yes, I……………
12. ………. it cold last night? - No, it……………. It was hot.
13. Where…………… they on Saturday? - They…………. at the store.
14. …………Nine and Bill strong this morning? - No, they………………
15. ………….Jimmy ill last night? - Yes, he …………………
5. Fill the blank with am/ is/ are.
1.The film _____interesting.
2. His father _______a dentist.
3. Children ______ in the classroom.
4. Your dog ______ nice.
5. I _____busy.
6. She ______my best friend.
7. We _______here.
8. John ______at home.
9. They ______ good people.
10.My parents _______teachers.
6. Complete the sentence with AM/ IS/ ARE
1. It ……………………… rainy and cool today.
2. I ……………………… at my office now.
3. They ……………………… from Australia.
4. There ……………………… a laptop on the desk.
5. My name ……………………… Nga.
6. We ……………………… Russian.
7. That ……………………… not true.
8. I ……………………… not too bad, thanks.
9. Giang and Nguyet ……………………… married.
10. She ……………………… a Math teacher.
11. This computer ……………………… him.
12. Jane and Peter ……………………… single.
13. My brother ……………………… at the school now.
14. Many people ……………………… in the shopping mall.
15. We ……………………… in Viet Nam.
16. It ……………………… Saturday today.
17. I ……………………… an content editor.
18. My name ……………………… Thu.
19. There ……………………… many people in this classroom.
20. …………… Annie your sister?
7. Complete the sentences with am, is or are.
1. A: Where's Jack?
B: He ______ playing football with his classmates.
2. A: Let's play table tennis!
B: Sorry. We ______ having dinner at the moment.
3. A: Where are Linda and Kate?
B: They ______ shopping. They want to buy dresses for their summer holiday.
4. A: Are you OK?
B: Yes, I ___ having great fun. What about you?
5. A: Please help me.
B: Sorry. I ___ reading a book about panda.
6. A: Can I talk to Lan, please?
B: She isn't at home. She _______ riding her bike with her brother.
Bài 1: Tìm x ∈ Z, biết:
Ix+2I+Ix+5I+Ix+9I+Ix+1I=5x
Bài 2: Chứng tỏ:
a.(a-b+c)-(a+c)
b.(a+b)-(b-a)+c=2a+c
c.-(a+b-c)+(a-b-c)=-2b
d.a(b+c)-a(b+d)=a(c-d)
e.a(b-c)+a(d+c)=a(b+d)
Bài 3: Tìm tất cả các cặp số nguyên (x;y) biết:
a.(x+3).(y-2)=7
b.(x-1).(xy+2)=5
Mọi người giúp mình làm bài với nha! Cảm ơn mn nhìu :D
I. Hãy viết lại các câu sau sao cho nghĩa của chúng không đổi
1. This table is big.
It's .............................
2. Lan is eleven
Lan is eleven years ....................
3. I'm Minh
My .............................
4. It's a small house
That ................
5. Is your clock small ?
Is it ............................
II. Hãy diễn đạt các mốc thời gian sau bằng chữ
1. 6 : 00
2. 8 : 30
3. 9 : 45
4. 5 : 10
5. 7 : 15
6. 10 : 20
7. 12 : 50
8. 4 : 55
9. 11 : 00
10. 10 : 25
III. Sắp xếp các từ dưới đây thành câu hoàn chỉnh
1. is / my / this / not / pen
2. dressed / gets / he / at / six o'clock
3. does / school / how / floors / many / your / have ?
4. fece / wash / does / what / the / he / time / his ?
5. small / bis / or / is / the / bag ?
cho n là só tự nhiên, chứng minh rằng n(n + 1)(n+2) chia hết cho 6
Tính
A=\(\dfrac{3^6\cdot45^4-15^{13}\cdot\left(\dfrac{1}{5}\right)^9}{27^4\cdot25^3+45^6}\)
Cho tam giác ABC vuông tại B. Tia phân giác của góc A căt BC tại D. Trên cạnh AC lấy điểm E sao cho AB = AE a) Chứng minh tam giác BAD bằng tam giác EAD b) Từ B kẻ BH vuông góc với AC. CHứng minh BH// DE c) Chứng minh AD là dường trung trực của BE.
dung tu goi y viet thanh cau hoan chinh
1, Sister / dressed / and / brush / teeth / 6 o'clock
2, You / grade 6 / or / 7
3, What time / you / family / brakfast ?
4, Minh / school / 3 floor / and / classroom / third floor
5, Our school / small / and / it / country
Write N for Now and F for Future.
1. Listen! Is that our telephone ringing?
2. They're going to the Fine Arts Museum this Saturday.
3. Where's Mai? He's doing judo in Room 2A.
4. She's travelling to Da Nang tomorrow.
5. Are you doing anything this Friday evening?
6. Yes,I'm watching a film with my friends