再求 f(x,n)

{
  "problem": {
    "name": "再求 f(x,n)",
    "description": {
      "content": "已知 $f(x,n)=\\dfrac{x}{n+\\dfrac{x}{(n-1)+\\dfrac{x}{(n-2)+\\dfrac{\\vdots}{\\cdots+\\dfrac{x}{1+x}}}}}$。 用递归函数求解。",
      "description_type": "Markdown"
    },
    "platform": "Luogu",
    "limit": {
      "time_limit": 1000,
      "memory_limit": 131072
    },
    "difficulty": {
      "LuoguStyle": "P1"
    },
    "is_remote": true,
    "is_sync": true,
    "sync_url": null,
    "sign": "LGB2148"
  },
  "statements": [
    {
      "statement_type": "Markdown",
      "content": "已知\n\n$f(x,n)=\\dfrac{x}{n+\\dfrac{x}{(n-1)+\\dfrac{x}{(n-2)+\\dfrac{\\vdots}{\\cdots+\\dfrac{x}{1+x}}}}}$。\n\n用递归函数求解。\n\n## Input\n\n第一个数是 $x$ 的值，第二个数是 $n$ 的值。（$x$ 为**实数**，$n$ 为整数）\n\n## Output\n\n函数值，保留两位小数。\n\n[sample...",
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      "language": "English"
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}