Ừ 1 ĐẾN 2017 CÓ TẤT CẢ CHỮ SỐ 1.

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Bạn đang xem: Ừ 1 đến 2017 có tất cả chữ số 1.




Tính mang lại 991

Hàng trăm 100 chữ số 1Hàng đơn vị 100 chữ số 1

Hàng chục 100 chữ số 1

Từ 1000 - 1999Hàng trăm 100 chữ số 1

Hàng chục 100 chữ số 1

hàng đơn vị chức năng 100 chữ số 1

Hàng nghìn 1000 chữ số 1

Từ 2000 - 2017 gồm 10 chữ số 1Vậy từ 1 - 2017 bao gồm 1610 chữ tiên phong hàng đầu (cộng toàn bộ các chiếc kia vào cùng nhau )k nha 100%



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* Xét dãy số từ một đến 1999, ta có:Chữ tiên phong hàng đầu ở hàng đơn vị là: (1991 - 1) : 10 + 1 = 200 (số)Chữ tiên phong hàng đầu ở hàng chục là: <(1910 - 10) : 100 + 1> x 10 = 200 (số)Chữ hàng đầu ở hàng trăm là: <(1100 - 100) : 1000 + 1> x 100 = 200 (số)Chữ hàng đầu ở hàng ngàn là: 1999 - 1000 + 1 = 1000 (số)* Xét dãy số trường đoản cú 2000 mang lại 2017, ta có 10 chữ tiên phong hàng đầu nữaVậy: từ là 1 đến 2017 bao gồm số chữ số 1 là: 200 + 200 + 200 + 1000 + 10 = 1610 (chữ số)



Tính cho 991Hàng trăm 100 chữ số 1Hàng đơn vị chức năng 100 chữ số 1Hàng chục 100 chữ số 1Từ 1000 - 1999Hàng trăm 100 chữ số 1Hàng chục 100 chữ số 1hàng đơn vị chức năng 100 chữ số 1Hàng ngàn 1000 chữ số 1Từ 2000 - 2017 tất cả 10 chữ số 1Vậy từ là 1 - 2017 bao gồm 1610 chữ số 1 (cộng toàn bộ các chiếc kia vào cùng nhau )

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1610 nha 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%


* Xét dãy số từ một đến 1999, ta có:Chữ tiên phong hàng đầu ở hàng 1-1 vị là: (1991 - 1) : 10 + 1 = 200 (số)Chữ tiên phong hàng đầu ở hàng chục là: <(1910 - 10) : 100 + 1> x 10 = 200 (số)Chữ tiên phong hàng đầu ở hàng trăm là: <(1100 - 100) : 1000 + 1> x 100 = 200 (số)Chữ hàng đầu ở hàng nghìn là: 1999 - 1000 + 1 = 1000 (số)* Xét dãy số tự 2000 đến 2017, ta tất cả 10 chữ số 1 nữaVậy: từ là một đến 2017 gồm số chữ tiên phong hàng đầu là: 200 + 200 + 200 + 1000 + 10 = 1610 (chữ số)


1610 là đúng 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%