1 chũ HOANGSA có 7 chữ vậy chữ thứ 2017 là :2017:7=288 dư 1 vậy sẽ có 288 chữ HOANGSA hoàn chỉnh dư 1 chữ thì sẽ là chữ H

H nha

Giảm số tiền là :

20000x3/10=6000(đồng)

Cần phải trả số tiền là :

20000-6000=14000(đồng)

giảm số tiền là :

20.000 ×3/10=6.000

Cần trả số tiền là:

20.000 - 6.000 = 14.000

A=61​+241​+601​+...+9702001​
�=11.2.3+12.3.4+13.4.5+...+198.99.100A=1.2.31​+2.3.41​+3.4.51​+...+98.99.1001​
Ta có:
11.2.3=12(11.2−12.3)1.2.31​=21​(1.21​−2.31​);
12.3.4=12(12.3−13.4)2.3.41​=21​(2.31​−3.41​);
...;
198.99.100=12(198.99−199.100)98.99.1001​=21​(98.991​−99.1001​)
�=12(11.2−12.3+12.3−13.4+...+198.99−199.100)A=21​(1.21​−2.31​+2.31​−3.41​+...+98.991​−99.1001​)
�=12(11.2−199.100)A=21​(1.21​−99.1001​)
�=12(99.100−2200.99)A=21​(200.9999.100−2​)
�=12(98998200.99)=4949919800A=21​(200.9998998​)=1980049499​

Sửa đề:

A = 1 + 6² + 6⁴ + 6⁶ + ... + 6²⁰²⁴

⇒ 36A = 6² + 6⁴ + 6⁶ + 6⁸ + ... + 6²⁰²⁶

⇒ 35A = 36A - A

= (6² + 6⁴ + 6⁶ + 6⁸ + ... + 6²⁰²⁶) - (1 + 6² + 6⁴ + 6⁶ + ... + 6²⁰²⁴)

= 6²⁰²⁶ - 1

⇒ A = (6²⁰²⁶ - 1) : 35

  Đề có vẻ chưa chuẩn em ơi?

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