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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

biện pháp tu từ nhân hóa

 - biện pháp tu từ đc sử dụng trong đoạn văn là nhân hóa 

tác dụng là muôn lm nổi bật cho câu văn và lm cho đoạn văn trở lên sinh đông 

Những con cá / Các con cá                                                                                                                                                                 Những chú mèo / Các chú mèo                                                                                                                                                                 

Em đã từng có dịp được tham gia thi đấu một trận kéo co. Chúng em đã đối đầu với đội kéo co của lớp 3C. Đó là trận chung kết kéo co của Hội thi Phù Đổng cấp trường. Mỗi đội gồm có mười thành viên. Khi trọng tài thổi còi, các thành viên của hai đội đều ra sức kéo. Tiếng hò reo cổ vũ của các thành viên trong lớp đã giúp chúng em có thêm sức mạnh. Sau hai lượt thi đấu, cả hai đội đang hòa nhau. Lượt đấu cuối cùng sẽ quyết định đội chiến thắng. Các thành viên trong đội tuy đã thấm mệt nhưng ai cũng rất quyết tâm. Ban đầu, đội bạn chiến ưu thế. Nhưng sau đó, nhân lúc đối thủ lơ là, chúng em đã dồn hết sức lực để đánh bại đối thủ. Em cảm thấy rất hạnh phúc vì lớp mình đã giành được chiến thắng.

Vào ngày mùng sáu tết hàng năm làng tôi thường tổ chức những trận kéo co để tìm ra xóm có sức dẻo dai nhất. Hôm đó tôi đang ngồi nhà chơi thì được chị gái kéo đi xem kéo co. Đó là trận kéo co giữa xóm Đông và xóm Bến.

Trận đấu sắp được bắt đầu, tôi và chị nắm chặt tay nhau chen qua làn người đông đúc và cuối cùng cũng vào được bên trong trung tâm. Ở đó là hai đội với lực lượng cực kì hùng mạnh mỗi bên là tám chàng trai cực kì khỏe mạnh. Người cầm cờ lúc này đang hô to để hai đội vào tư thế chuẩn bị. Một phút sau là cờ của người trọng tài phất báo biểu trận kéo co đã bắt đầu.

Hai đội lúc này như hai con trâu ra sức kéo cho bằng được về phía mình. Sợi dây vẫn không di chuyển hai đội đang trong thế ngang tài ngang sức bất phân thắng bại. Tiếng hò reo bên ngoài mỗi lúc một thêm to bên này thì “xóm Đông cố lên”, bên kia cũng không chịu thua cũng hô to không kém gì “xóm Hát cố lên”. Trong khi đó trận đấu diễn ra ngày một kịch tính hơn khi mà phía bên đội xóm Đông có vẻ đã yếu dần.

Và rồi bên đội xóm Hát bỗng người dẫn đầu ngã xuống tay không còn nắm được chặt sợi dây nữa. Dường như anh này đã kiệt sức. Nhân cơ hội ấy đội xóm Đông giật mạnh sợi dây về phía mình và kết quả là làm cho tất cả những thành viên bên đội xóm Hát đang mải chú ý đến người đội trưởng, họ ngã nhào ra đất và phần thắng đương nhiên thuộc về phía những người thanh niên xóm Đông.

Cuối buổi kéo co ban tổ chức trao giải thưởng cho cả hai đội. Dù có thất bại hay thành công thì họ cũng đã cố gắng hết sức và họ dù thế nào thì họ cũng nên tự hào vì điều đó. Đây là một trận kéo co gay cấn và hay nhất mà tôi từng được xem.

hok tốt

@Thuu

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