Từ 1 đến 2017 có tất cả chữ số 1.

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Tính mang đến 991

Hàng trăm 100 chữ số 1Hàng đơn vị chức năng 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 có 10 chữ số 1Vậy từ là 1 - 2017 bao gồm 1610 chữ tiên phong hàng đầu (cùng tất cả các dòng kia vào với nhau )k nha 100%



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



Tính mang lại 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 1sản phẩm đơn vị chức năng 100 chữ số 1Hàng ngàn 1000 chữ số 1Từ 2000 - 2017 bao gồm 10 chữ số 1Vậy từ 1 - 2017 gồm 1610 chữ tiên phong hàng đầu (cùng tất cả những loại kia vào với nhau )

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1610 nha 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%


* Xét dãy số từ một mang đến 1999, ta có:Chữ tiên phong hàng đầu nghỉ ngơi hàng solo vị là: (1991 - 1) : 10 + 1 = 200 (số)Chữ hàng đầu ngơi nghỉ hàng chục là: <(1910 - 10) : 100 + 1> x 10 = 200 (số)Chữ hàng đầu sống hàng trăm là: <(1100 - 100) : 1000 + 1> x 100 = 200 (số)Chữ số 1 ngơi nghỉ hàng nghìn là: 1999 - 1000 + 1 = 1000 (số)* Xét dãy số từ 2000 cho 2017, ta bao gồm 10 chữ hàng đầu nữaVậy: Từ 1 cho 2017 gồm số chữ hàng đầu là: 200 + 200 + 200 + 1000 + 10 = 1610 (chữ số)


1610 là đúng 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%