Câu hỏi của Pham Trong Bach

Question

Viết liên tiếp 15 số lẻ đầu tiên để được một số tự nhiên. Hãy xoá đi 15 chữ số của số tự nhiên vừa nhận được mà vẫn giữ nguyên thứ tự các chữ số còn lại để được:
a, Số lớn nhất.
b, Số nhỏ nhất.

Viết các số đó.

Cao Minh Tâm · Accepted Answer

Viết 15 số lẻ đầu tiên liên tiếp ta được số tự nhiên:1 3 5 7 9 11 13 15 17 19 21 23 25 27 29Để sau khi xoá 15 chữ số ta nhận được số lớn nhất thì chữ số giữ lại đầu tiên kể từ bên trái phải là chữ số 9. Vậy trước hết ta xoá 4 chữ số đầu tiên của dãy 1, 3, 5, 7. Số còn lại là:9 11 13 15 17 19 21 23 25 27 29Ta phải xoá tiếp 15 – 4 = 11 chữ số còn lại để được số lớn nhất. Để sau khi xoá nhận được số lớn nhất thì chữ số thứ hai kể từ bên trái phải là chữ số 9. Vậy tiếp theo ta phải xoá tiếp những chữ số viết giữa hai chữ số 9 trong dãy, đó là 11 13 15 17 1. Số còn lại là:992 123 252 729.Ta phải xoá tiếp 11 – 9 = 2 chữ số từ số còn lại để được số lớn nhất. Chữ số thứ ba còn lại kể từ bên trái phải là 2, vậy để được số lớn nhất sau khi xoá 2 chữ số ta phải xoá số 12 hoặc 21. Vậy số lớn nhất phải là9 923 252 729.
b, Lập luận tương tự câu a. số phải tìm là 1 111 111 122Câu trả lời: Viết 15 số lẻ đầu tiên liên tiếp ta được số tự nhiên:1 3 5 7 9 11 13 15 17 19 21 23 25 27 29Để sau khi xoá 15 chữ số ta nhận được số lớn nhất thì chữ số giữ lại đầu tiên kể từ bên trái phải là chữ số 9. Vậy trước hết ta xoá 4 chữ số đầu tiên của dãy 1, 3, 5, 7. Số còn lại là:9 11 13 15 17 19 21 23 25 27 29Ta phải xoá tiếp 15 – 4 = 11 chữ số còn lại để được số lớn nhất. Để sau khi xoá nhận được số lớn nhất thì chữ số thứ hai kể từ bên trái phải là chữ số 9. Vậy tiếp theo ta phải xoá tiếp những chữ số viết giữa hai chữ số 9 trong dãy, đó là 11 13 15 17 1. Số còn lại là:992 123 252 729.Ta phải xoá tiếp 11 – 9 = 2 chữ số từ số còn lại để được số lớn nhất. Chữ số thứ ba còn lại kể từ bên trái phải là 2, vậy để được số lớn nhất sau khi xoá 2 chữ số ta phải xoá số 12 hoặc 21. Vậy số lớn nhất phải là9 923 252 729.
b, Lập luận tương tự câu a. số phải tìm là 1 111 111 122

nguyem · Answer

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Các câu hỏi tương tự

PB

Pham Trong Bach

19 tháng 2 2019 lúc 7:20

Viết liên tiếp 15 số lẻ đầu tiên để được một số tự nhiên. Hãy xoá đi 15 chữ số của số tự nhiên vừa nhận được mà vẫn giữ nguyên thứ tự các chữ số còn lại để được:
a, Số lớn nhất.
b, Số nhỏ nhất.

Viết các số đó.

Câu hỏi

Khoá học trên OLM (olm.vn)

Khoá học trên OLM (olm.vn)