\(\left(+\right)22+4\left(2x-4\right)=-26\)

\(\Leftrightarrow22+8x-16=-26\)

\(\Leftrightarrow x=\dfrac{-26-22+16}{8}=-4\)

\(\left(+\right)71-\left(8-x\right)=-12+71\)

\(\Leftrightarrow71-8+x=-12+71\)

\(\Leftrightarrow x=-12+71-71+8=-4\)

La sao

60729; 72360; 1292760; 269

KQ: 160729; 72360; 1292760; 84

tổng của số nhỏ nhất có một chữ số với 2671 là 2671+0=2671

goi so thu nhat la x thi so thu 2 la 6592-x ( x la so tu nhien) 
Nếu viêt thêm vào bên phải số thứ nhất một số có một chữ số thì ta đươc số thứ hai 
=> 10x+a=6592-x (vi a la chu so hang don vi cua so thu 2 nen 0<=a<=9) 
=> x=(6592-a)/11=[6589+(3-a)]/11 = 599+(3-a)/11 (1) 
=> de x la so tu nhien thi 8+a phai chia het cho 11 
mat khac 0<=a<=9 => a chi co the bang 3 
thay a=3 vao (1) ta duoc x=599 
=> so thu hai la 6595-599=5993

Vì viết vào bên phải một chữ số tức là số thứ hai gấp 10 lần số thứ nhất thêm một số đơn vị là chữ số viết thêm (thí dụ: 1234 = 10 lần 123 thêm 4) 
VẼ sơ đồ: 
I---I 
I---I---I---I---I---I---I---I---I---I-... 
Tổng số phần là 11 phần (thêm chữ số viết thêm) 
Ta lại có giá trị nguyên của mỗi phần : 
6592:11=599 (dư 3) 
Vậy số bé là 599 
chữ số viết thêm là 3 
số lớn là: 599x10 +3=5993 
(hoặc 6592-599=5993)

1. Where do you (live) live ? I (live) live in Hai Duong town.
2. What is he (do) doing now? He (water) is watering flowers in the garden.
3. What does she (do) do ? She (be) is a teacher.
4. Where are you (be) from?
5. At the moment, my sisters (play) are playing volleyball and my brother (play) is playing soccer.
6. it is 9.00; my family (watch) are wathing TV.
7. In the summer, I usually (go) go to the park with my friends, and in the spring, we (have) have Tet Holiday; I (be) am happy because I always (visit) visit my granparents.
8. Does your father (go) go to work by bus?
9. How does your sister (go) go to school?
10. What time do they (get up) get up ?
11. What do they (do) do in the winter?
12. Today, we (have) have English class.
13. Her favourite subject (be) is English.
14. Now, my brother (like) likes eating bananas.
15. Look! A man (call) is calling you.
16. Keep silent ! I (listen ) am listening to the radio.
17. Are you (play) playing badminton now?
18. Everyday, my father (get up) gets up at 5.00 a.m.
19. Every morning, I (watch) watch tv at 10.00.
20. Everyday, I (go) go to school by bike.
21. Every morning, my father (have) has a cup of coffe.
22. At the moment, I(read) am reading a book and my brother (watch) are watching TV.
23. Hoa (live) lives in Hanoi, and Ha (live) lives in HCM City.
24. Hung and his friend (play) are playing badminton at the present.
25. They usually (get up) get up at 6. oo in the morning.
26. Ha never (go) goes fishing in the winter but she always (do) does it in the summer.
27. My teacher (tell) is telling Hoa about Math at the moment.
28. There (be) are animals in the circus.
29. Does he (watch) watch TV at 7.00 every morning?
30. What does she (do ) do at 7.00 am?
31. How old is she (be)?
32. How is she (be)?
33. My children (Go) go to school by bike.
34. We (go) go to supermarket to buy some food.
35. Mr. Hien (go) goes on business to Hanoi every month.
36. Ha (like) likes coffee very much, but I (not like) don't like it.
37. She (like ) likes Tea, but she (not like) doesn't like coffee.
38. I (love) love cats, but I (not love) don't love dogs.
39. Everyday, I (go) go to school on foot.
40. Do you wait (wait) for Nam?

– No, I wait (wait) for Mr. Hai.

1. Where do you (live) live ? I (live) live in Hai Duong town.
2. What is he (do) doing now ? He (water) is watering flowers in the garden.
3. What does she (do) do ? She (be) is a teacher.
4. Where are you (be) from?
5. At the moment, my sisters (play) are playing volleyball and my brother (play) is playing soccer.
6. it is 9.00; my family (watch) is wathing TV.
7. In the summer, I usually (go) go to the park with my friends, and in the spring, we (have) have Tet Holiday; I (be) am happy because I always (visit) visit my granparents.
8. Does your father (go) go to work by bus ?
9. How does your sister (go) go to school ?
10. What time do they (get up) get up ?
11. What do they (do) do in the winter?
12. Today, we (have) have English class.
13. Her favourite subject (be) is English.
14. Now, my brother (like) likes eating bananas.
15. Look! A man (call) is calling you.
16. Keep silent ! I (listen ) am listening to the radio.
17. Are you (play) playing badminton now?
18. Everyday, my father (get up) gets up at 5.00 a.m.
19. Every morning, I (watch) watch tv at 10.00.
20. Everyday, I (go) go to school by bike.
21. Every morning, my father (have) has a cup of coffe.
22. At the moment, I (read) am reading a book and my brother (watch) is watching TV.
23. Hoa (live) lives in Hanoi, and Ha (live) lives in HCM City.
24. Hung and his friend (play) are playing badminton at the present.
25. They usually (get up) get up at 6. oo in the morning.
26. Ha never (go) goes fishing in the winter but she always (do) does it in the summer.
27. My teacher (tell) is telling Hoa about Math at the moment.
28. There (be) are animals in the circus.
29. Does he (watch) watch TV at 7.00 every morning?
30. What does she (do ) do at 7.00 am?
31. How old is she (be)?
32. How is she (be)?
33. My children (Go) go to school by bike.
34. We (go) go to supermarket to buy some food.
35. Mr. Hien (go) goes on business to Hanoi every month.
36. Ha (like) likes coffee very much, but I (not like) don't like it.
37. She (like ) likes Tea, but she (not like) doesn't like coffee.
38. I (love) love cats, but I (not love) don't love dogs.
39. Everyday, I (go) go to school on foot.
40. Do you wait (wait) for Nam?

– No, I am waiting (wait) for Mr. Hai.