12,8

tick mk nha bn 

vào câu hỏi tương tự đó

thiếu đề rùi bạn ơi !!!!!!

Hiệu số bàn thắng - thua năm ngoái là:

27 - 48 = -21

Hiệu số bàn thắng - thua năm nay là:

39 - 24 = 15

27. The last time we contacted was 3 months ago.
= We haven’t contacted for 3 months
28. It is a long time since I last wrote to her.

= I haven’t written to her for a long time.
29. When did you start to wait for the bus?
= How long have you waited for the bus ?
31. He last sent me postcards when he was in Paris.
= The last time he sent me postcards was when he was in Paris.

= He hasn’t sent me postcards since he was in Paris.
32. They haven’t visited their hometown since they were 12.
= They last time they visited their hometown was when they were 12.

33. This is the first time she has read such a romantic novel.
= She hasn’t read such a romantic novel before.
34. We began to talk two hours ago.
= It’s two hours since we last talked .
35. My father started to work as an engineer when he was 22.
= My father has worked as an engineer since he was 22.
36. She last sent me letters last year.
= She hasn’t sent me letters since last year

= The last time she sent me letters was in last year.
37. The last time she phoned her parents was ages ago.
= It’s ages since she has phoned her parents.
38. It is a long time since we last went to this restaurant.
= We haven’t gone to this restaurant for a long time.
39. When did you move to this house?
= How long have you moved to this house ?
40. She moved to this city 4 weeks ago.
= She has moved to this city for 4 weeks
41. I haven’t seen my brother for many years.
= The last time I saw my brother was many years ago.
42. We haven’t been taken to the zoo for 5 months.
= The last time we were taken to the zoo was 5 months ago.

1. Her hair is long and black.

She has long black hair.

2. Lan has a toothache.

She should go to the dentist.

3. The red dictionary is more expensive than the blue dictionary.

The blue dictionary is not as expensive as the red dictionary.

4. We took a train to Leverpool last Saturday.

We went to Liverpool by a train last saturday.

5. Where can I find the station?

Could you show me the way to the station ?

xy+x+y= -5

(x+1)y+x =-5

(x+1)y+x-(-5)=0

(X+1)y+x+5=0

x+1=0

x= -1

y+1=0

y= - 1 

Nhóc Hải Thông Thái giải cái gì mình không hiểu

Bài 2:

Số chữ số cần viết để đánh số trang có 1 chữ số là
1 x [(9-1):1+1] = 9 chữ số
Số chữ số cần viết để đánh số trang có 2 chữ số là
2 x [(99-10):1+1] = 180 chữ số
Số chữ số cần viết để đánh số trang có 3 chữ số là
3 x [(999-100):1+1] = 2700 chữ số
Vậy số trang của cuốn sách ko quá 3 chữ số
Số chữ số dùng để đánh số các trang có 3 chữ số của cuốn sách là
987 - 180 - 9 = 798 (chữ số)
Số trang được viết bởi số có 3 chữ số là
798 : 3 = 266 (trang)
số trang được viết bới số có 2 chữ số là
180 : 2 = 90 (trang)
số trang được viết bởi số có 1 chữ số là
9 : 1 = 9 (trang)
Vậy cuốn sách có :
266 + 90 + 9 = 365 (trang).

Đáp số 365 trang