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Create README.zh-CN.md (trekhleb#267)

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	`1`	`+#阶乘`
	`2`	`+`
	`3`	+在数学上, 一个正整数`n` 的阶乘 (写作`n!`), 就是所有小于等于`n` 的正整数的乘积. 比如:
	`4`	`+`
	`5`	+```
	`6`	`+5! = 5 * 4 * 3 * 2 * 1 = 120`
	`7`	+```
	`8`	`+`
	`9`	`+\| n\| n!\|`
	`10`	`+\| -----\| --------------------------:\|`
	`11`	`+\| 0\| 1\|`
	`12`	`+\| 1\| 1\|`
	`13`	`+\| 2\| 2\|`
	`14`	`+\| 3\| 6\|`
	`15`	`+\| 4\| 24\|`
	`16`	`+\| 5\| 120\|`
	`17`	`+\| 6\| 720\|`
	`18`	`+\| 7\| 5 040\|`
	`19`	`+\| 8\| 40 320\|`
	`20`	`+\| 9\| 362 880\|`
	`21`	`+\| 10\| 3 628 800\|`
	`22`	`+\| 11\| 39 916 800\|`
	`23`	`+\| 12\| 479 001 600\|`
	`24`	`+\| 13\| 6 227 020 800\|`
	`25`	`+\| 14\| 87 178 291 200\|`
	`26`	`+\| 15\| 1 307 674 368 000\|`
	`27`	`+`

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