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LINH ĐAN SO KUTE
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Đinh Thùy Linh
4 tháng 7 2016 lúc 17:20

Số gồm các số tự nhiên liên tiếp từ 1 đến 20 là:

A = 1234567891011121314151617181920

a) Ta nhận thấy trong A chỉ có 2 chữ số 9 nên số lớn nhất có 9 chữ số sau khi xóa chỉ có thể là: 992.

12345678 9 1011121314151617181 92 0

b) Số nhỏ nhất có 3 chữ số khác nhau trong mọi trường hợp đều là: 102.

Trong trường hợp này cũng thỏa mãn: 1234567891011121314151617181920.

Trình bày thế là rõ chưa ạ!

Lần sau post bài mà cứ bắt người khác "PHẢI" là không giúp nữa!

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Nguyễn Ngọc Huyền
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Dương Minh Tiến
16 tháng 9 2015 lúc 8:45

Các số là:

2035;2053;2305;2350;2503;2530;3025;3052;3205;3250;3502;3520;5023;5032;5203;5230;5302;5320

2035+2053+2305+2350+2503+2530+3025+3052+3205+3250+3502+3520+5023+5032+5203+5230+5302+5320=44563

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anh chàng mưa
16 tháng 9 2015 lúc 8:44

Quá trời luôn. Bạn đánh siêu thật !

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Tạ Giang Mai Anh
19 tháng 3 2016 lúc 21:24

Tinh tong sai bet .phai la 64440.

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Lê Nguyễn Mai Trang
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Kiều Bích Huyền
21 tháng 7 2015 lúc 18:00

Số viết đc:1234567891011121314151617181920.

-Số lớn nhất:92456781920.

-Số bé nhất :10111111110.

Theo mk là thế...Đúng sai kệ bn nha..^.^!

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Nguyễn Công Biển
21 tháng 7 2015 lúc 18:08

thao nình thì muốn có số bé nhất thì ta nên xóa các chữ số có giá trị lớn trước vd xóa hết các cs 9 rồi xóa hết các cs 8,...đến khi đủ 20cs 

tương tự với lớn nhất

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tạ hữu nguyên
30 tháng 3 2017 lúc 17:55

cho mk một tk đi bà con ơi

ủng hộ mk đi làm ơn

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Chu Diệu Linh
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Nguyễn Anh Thư
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nguyen ha hieu
13 tháng 3 2017 lúc 12:14

nho nhat

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Pham Trong Bach
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Cao Minh Tâm
19 tháng 2 2019 lúc 7:21

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 29
Để 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 tr
ước 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 29
Ta 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 là
9 923 252 729.

b, Lập luận tương tự câu a. số phải tìm là 1 111 111 122

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Pham Trong Bach
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Cao Minh Tâm
15 tháng 1 2019 lúc 18:17

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 29
Để 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 29
Ta 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 là
9 923 252 729.

b, Lập luận tương tự câu a. số phải tìm là 1 111 111 122

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nguyem
11 tháng 6 lúc 21:20
 
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Pham Trong Bach
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Cao Minh Tâm
4 tháng 3 2017 lúc 5:59

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 29

Để 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 29

Ta 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 là 9 923 252 729.

b, Lập luận tương tự câu a. số phải tìm là 1 111 111 122

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