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huong ha
Giới thiệu về bản thân
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bạn cho ngắn đi
Máy bay được phát minh vào năm: 1886+7=1893 vào thế kỉ 19
Ô tô được phát minh vào năm 1886 thế kỉ 19
Đầu xe lửa được phát minh vào năm: 1893-9=1794 vào thế kỉ 18
Exercise 4; Fill in the blank with ONE word.
1. She likes writing stories. She wants to be a/an ……writer………………………
2. My brother wants to fly a plane. He’d like to become a/an ……pilot…………………
3. She wants to teach children. She wants to become a/ an…teacher………………………..
4. Nam likes drawing and designing buildings. He would like to be a/ an
……architect……………………………when he grows up
5. My cousin enjoys playing football. He wants to become a /an …footballer…………………..
6. He’d like to fly in space and work with other people in a spaceship. He’d like to be
a / an…astronaut………………………
7. She would like to look after patients. She would like to be a /an…nurse……………….
8. My daughter likes singing. She would like to be a/ an……singer………………….
writer
pilot
teacher
architect
footballer
astronaut
nurse
singer
Trung: What would you (1) …………like…………………….to be in the future?
Huong: I would like to be a (2)………………teacher………………………………..
Trung: Why?
Huong: (3)……………because………………………………. I would like to teach young children.
Trung: Working (4)…………in………………………a teacher is hard work.
Huong: Yes, I know. But it is a rewarding job. How about you?
Trung: I would like to become a (5)…………footballer………………………because I like playing soccer so much.
https://lazi.vn/group/d/17374/hoi-ngot-ngao
Đặt tổng là A = 1 + 2 + 2^2 + 2^3 + ... + 2^2002 = 1 + 2 + B
Kể từ số hạng 2^2 đến 2^2002 có 2001 số hạng mà nhóm ba số hạng liên tiếp ta được một số chia hết cho 7
Do đó B = 2^2 + 2^3 + 2^4 + ... + 2^2000 + 2^2001 + 2^2002
= 2^2 (1 + 2 + 2^2) + ... + 2^2000 (1 + 2 + 2^2)
= 2^2. 7 + 2^5 . 7 + ... + 2^2000. 7
=> B chia hết cho 7
Vậy A = 3 + B
nên A chia 7 dư 3
Tìm x :
2/2.4 + 2/4.6 +....+ 2/x(x+2) = 4/9
=> 1/2 - 1/4 + 1/4 - 1/6 + ...+ 1/x - 1/(x + 2) = 4/9
=> 1/2 - 1/(x + 2) = 4/9
=> 1/(x + 2) = 1/18
=> x + 2 = 18
=> x = 16