B nha ht

B nha bạn

méo biết

BUURBUUR

BUURBUUR

BUURBUUR

BUURBUUR

Chọn các ô bạn muốn gộp > Nhấn tổ hợp phím Alt + H + M > Nhấn một trong các phím sau đây: C để gộp và căn lề chính giữa cho các ô.

có phải ko 

là điểm hỏi đáp nha

bn phải trả lời đúng chính xác các câu trả lời để đc tiick và trả lời cho người có điểm hỏi đáp cao thì điểm của bn sẽ cao

#HOk tốt

II. Cách nhận biết câu trả lời đúng

Trên diễn đàn có thể có rất nhiều bạn tham gia giải toán. Vậy câu trả lời nào là đúng và tin cậy được? Các bạn có thể nhận biết các câu trả lời đúng thông qua 6 cách sau đây:

1. Lời giải rõ ràng, hợp lý (vì nghĩ ra lời giải có thể khó nhưng rất dễ để nhận biết một lời giải có là hợp lý hay không. Chúng ta sẽ học được nhiều bài học từ các lời giải hay và hợp lý, kể cả các lời giải đó không đúng.)

2. Lời giải từ các giáo viên của Online Math có thể tin cậy được (chú ý: dấu hiệu để nhận biết Giáo viên của Online Math là các thành viên có gắn chứ "Quản lý" ở ngay sau tên thành viên.)

3. Lời giải có số bạn chọn "Đúng" càng nhiều thì càng tin cậy.

4. Người trả lời có điểm hỏi đáp càng cao thì độ tin cậy của lời giải sẽ càng cao.

5. Các bài có dòng chữ "Câu trả lời này đã được Online Math chọn" là các lời giải tin cậy được (vì đã được duyệt bởi các giáo viên của Online Math.)

6. Các lời giải do chính người đặt câu hỏi chọn cũng là các câu trả lời có thể tin cậy được.

#Hok tốt

????????????????????????????????????????????????

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\l\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\kl\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

Từ trang 1 đến trang 9 có số trang là :

( 9 - 1 ) : 1 + 1 = 9 ( trang ) mà mỗi trang cần 1 chữ số để đánh 

=> Cần số chữ số để đánh là : 

9 x 1 = 9 ( chữ số )

Các trang từ 10 đến 99 có số trang là :

( 99 - 10 ) : 1 + 1 - 90 ( trang ) mà mỗi trang cần 2 chữ số để đánh

=> Cần số chữ số là :

90 x 2 = 180 ( chữ số )

Vì 9 < 165 < 180 => Với 165 chữ số ta chỉ đánh được đến các trang có 2 chữ số thôi

Như vậy , khi dùng 165 chữ số để đánh các trang từ 1 đến 9 thì còn lại số chữ số là :

165 - 9 = 156 ( chữ số )

Với 156 chữ số thì đánh được số tảng có 2 chữ số là :

156 : 2 = 78 ( trang )

Vậy cuốn sách có tất cả số trang là :

78 + 9 = 87 ( trang )

chứ số 4 ở hàng đơn vị có dạng \(\overline{a4}\) với \(0\le a\le5\) nên có 6 chứ sô 4 ở hàng đơn vị

chữ số 4 ở hàng chục có dạng \(\overline{4b}\) với \(0\le b\le9\) vậy có 10 chữ số 4 ở hàng chucj

cộng lại ta đã dùng 16 chữ số 4

Ta có:

Trang: 4; 14; 24; 34; 44; 54

Trên đây là tất cả 6 số có chữ số 4, vậy:

- Ít nhất ta cần dùng 6 chữ số 4

Nhưng:

- Vì số 44 có hai chữ số 4 nên:

6 + 1 = 7 (chữ số)

~ Hok T ~

Địa thế:Đi lên được đến Cao Bằng phải leo qua đèo Gió, đèo Giàng, đèo Cao Bắc… những từ "sau khi… lại vượt… lại vượt…" nói lên địa thế hiểm trở, đồi núi trập trùng và xa xôi của Cao Bằng.

Cây trái:Đầu tiên là mận ngọt /Đón môi ta dịu dàng.Đến Cao Bằng ta sẽ được tiếp đãi ngay món mận – một thứ hoa quả đặc trưng của Cao Bằng

Tình yêu đất nước của người Cao Bằng cao như núi, không đo hết được. Tình yêu nước đó còn trong trẻo và sâu sắc như suối sâu.

chạy về ăn trưa

Vì bị chó đuổi