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发表于 2018-11-16 13:58:33
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$\frac{\frac{\frac{\frac{\frac{\frac{\frac{\frac{\frac{1}{2}}{\frac{3}{4}}}{\frac{\frac{5}{6}}{\frac{7}{8}}}}{\frac{\frac{\frac{9}{10}}{\frac{11}{12}}}{\frac{\frac{13}{14}}{\frac{15}{16}}}}}{\frac{\frac{\frac{\frac{17}{18}}{\frac{19}{20}}}{\frac{\frac{21}{22}}{\frac{23}{24}}}}{\frac{\frac{\frac{25}{26}}{\frac{27}{28}}}{\frac{\frac{29}{30}}{\frac{31}{32}}}}}}{\frac{\frac{\frac{\frac{\frac{33}{34}}{\frac{35}{36}}}{\frac{\frac{37}{38}}{\frac{39}{40}}}}{\frac{\frac{\frac{41}{42}}{\frac{43}{44}}}{\frac{\frac{45}{46}}{\frac{47}{48}}}}}{\frac{\frac{\frac{\frac{49}{50}}{\frac{51}{52}}}{\frac{\frac{53}{54}}{\frac{55}{56}}}}{\frac{\frac{\frac{57}{58}}{\frac{59}{60}}}{\frac{\frac{61}{62}}{\frac{63}{64}}}}}}}{\frac{\frac{\frac{\frac{\frac{\frac{65}{66}}{\frac{67}{68}}}{\frac{\frac{69}{70}}{\frac{71}{72}}}}{\frac{\frac{\frac{73}{74}}{\frac{75}{76}}}{\frac{\frac{77}{78}}{\frac{79}{80}}}}}{\frac{\frac{\frac{\frac{81}{82}}{\frac{83}{84}}}{\frac{\frac{85}{86}}{\frac{87}{88}}}}{\frac{\frac{\frac{89}{90}}{\frac{91}{92}}}{\frac{\frac{93}{94}}{\frac{95}{96}}}}}}{\frac{\frac{\frac{\frac{\frac{97}{98}}{\frac{99}{100}}}{\frac{\frac{101}{102}}{\frac{103}{104}}}}{\frac{\frac{\frac{105}{106}}{\frac{107}{108}}}{\frac{\frac{109}{110}}{\frac{111}{112}}}}}{\frac{\frac{\frac{\frac{113}{114}}{\frac{115}{116}}}{\frac{\frac{117}{118}}{\frac{119}{120}}}}{\frac{\frac{\frac{121}{122}}{\frac{123}{124}}}{\frac{\frac{125}{126}}{\frac{127}{128}}}}}}}}{\frac{\frac{\frac{\frac{\frac{\frac{\frac{129}{130}}{\frac{131}{132}}}{\frac{\frac{133}{134}}{\frac{135}{136}}}}{\frac{\frac{\frac{137}{138}}{\frac{139}{140}}}{\frac{\frac{141}{142}}{\frac{143}{144}}}}}{\frac{\frac{\frac{\frac{145}{146}}{\frac{147}{148}}}{\frac{\frac{149}{150}}{\frac{151}{152}}}}{\frac{\frac{\frac{153}{154}}{\frac{155}{156}}}{\frac{\frac{157}{158}}{\frac{159}{160}}}}}}{\frac{\frac{\frac{\frac{\frac{161}{162}}{\frac{163}{164}}}{\frac{\frac{165}{166}}{\frac{167}{168}}}}{\frac{\frac{\frac{169}{170}}{\frac{171}{172}}}{\frac{\frac{173}{174}}{\frac{175}{176}}}}}{\frac{\frac{\frac{\frac{177}{178}}{\frac{179}{180}}}{\frac{\frac{181}{182}}{\frac{183}{184}}}}{\frac{\frac{\frac{185}{186}}{\frac{187}{188}}}{\frac{\frac{189}{190}}{\frac{191}{192}}}}}}}{\frac{\frac{\frac{\frac{\frac{\frac{193}{194}}{\frac{195}{196}}}{\frac{\frac{197}{198}}{\frac{199}{200}}}}{\frac{\frac{\frac{201}{202}}{\frac{203}{204}}}{\frac{\frac{205}{206}}{\frac{207}{208}}}}}{\frac{\frac{\frac{\frac{209}{210}}{\frac{211}{212}}}{\frac{\frac{213}{214}}{\frac{215}{216}}}}{\frac{\frac{\frac{217}{218}}{\frac{219}{220}}}{\frac{\frac{221}{222}}{\frac{223}{224}}}}}}{\frac{\frac{\frac{\frac{\frac{225}{226}}{\frac{227}{228}}}{\frac{\frac{229}{230}}{\frac{231}{232}}}}{\frac{\frac{\frac{233}{234}}{\frac{235}{236}}}{\frac{\frac{237}{238}}{\frac{239}{240}}}}}{\frac{\frac{\frac{\frac{241}{242}}{\frac{243}{244}}}{\frac{\frac{245}{246}}{\frac{247}{248}}}}{\frac{\frac{\frac{249}{250}}{\frac{251}{252}}}{\frac{\frac{253}{254}}{\frac{255}{256}}}}}}}}}{...}=\sqrt{2}/2$
\frac{\frac{\frac{\frac{\frac{\frac{\frac{\frac{\frac{1}{2}}{\frac{3}{4}}}{\frac{\frac{5}{6}}{\frac{7}{8}}}}{\frac{\frac{\frac{9}{10}}{\frac{11}{12}}}{\frac{\frac{13}{14}}{\frac{15}{16}}}}}{\frac{\frac{\frac{\frac{17}{18}}{\frac{19}{20}}}{\frac{\frac{21}{22}}{\frac{23}{24}}}}{\frac{\frac{\frac{25}{26}}{\frac{27}{28}}}{\frac{\frac{29}{30}}{\frac{31}{32}}}}}}{\frac{\frac{\frac{\frac{\frac{33}{34}}{\frac{35}{36}}}{\frac{\frac{37}{38}}{\frac{39}{40}}}}{\frac{\frac{\frac{41}{42}}{\frac{43}{44}}}{\frac{\frac{45}{46}}{\frac{47}{48}}}}}{\frac{\frac{\frac{\frac{49}{50}}{\frac{51}{52}}}{\frac{\frac{53}{54}}{\frac{55}{56}}}}{\frac{\frac{\frac{57}{58}}{\frac{59}{60}}}{\frac{\frac{61}{62}}{\frac{63}{64}}}}}}}{\frac{\frac{\frac{\frac{\frac{\frac{65}{66}}{\frac{67}{68}}}{\frac{\frac{69}{70}}{\frac{71}{72}}}}{\frac{\frac{\frac{73}{74}}{\frac{75}{76}}}{\frac{\frac{77}{78}}{\frac{79}{80}}}}}{\frac{\frac{\frac{\frac{81}{82}}{\frac{83}{84}}}{\frac{\frac{85}{86}}{\frac{87}{88}}}}{\frac{\frac{\frac{89}{90}}{\frac{91}{92}}}{\frac{\frac{93}{94}}{\frac{95}{96}}}}}}{\frac{\frac{\frac{\frac{\frac{97}{98}}{\frac{99}{100}}}{\frac{\frac{101}{102}}{\frac{103}{104}}}}{\frac{\frac{\frac{105}{106}}{\frac{107}{108}}}{\frac{\frac{109}{110}}{\frac{111}{112}}}}}{\frac{\frac{\frac{\frac{113}{114}}{\frac{115}{116}}}{\frac{\frac{117}{118}}{\frac{119}{120}}}}{\frac{\frac{\frac{121}{122}}{\frac{123}{124}}}{\frac{\frac{125}{126}}{\frac{127}{128}}}}}}}}{\frac{\frac{\frac{\frac{\frac{\frac{\frac{129}{130}}{\frac{131}{132}}}{\frac{\frac{133}{134}}{\frac{135}{136}}}}{\frac{\frac{\frac{137}{138}}{\frac{139}{140}}}{\frac{\frac{141}{142}}{\frac{143}{144}}}}}{\frac{\frac{\frac{\frac{145}{146}}{\frac{147}{148}}}{\frac{\frac{149}{150}}{\frac{151}{152}}}}{\frac{\frac{\frac{153}{154}}{\frac{155}{156}}}{\frac{\frac{157}{158}}{\frac{159}{160}}}}}}{\frac{\frac{\frac{\frac{\frac{161}{162}}{\frac{163}{164}}}{\frac{\frac{165}{166}}{\frac{167}{168}}}}{\frac{\frac{\frac{169}{170}}{\frac{171}{172}}}{\frac{\frac{173}{174}}{\frac{175}{176}}}}}{\frac{\frac{\frac{\frac{177}{178}}{\frac{179}{180}}}{\frac{\frac{181}{182}}{\frac{183}{184}}}}{\frac{\frac{\frac{185}{186}}{\frac{187}{188}}}{\frac{\frac{189}{190}}{\frac{191}{192}}}}}}}{\frac{\frac{\frac{\frac{\frac{\frac{193}{194}}{\frac{195}{196}}}{\frac{\frac{197}{198}}{\frac{199}{200}}}}{\frac{\frac{\frac{201}{202}}{\frac{203}{204}}}{\frac{\frac{205}{206}}{\frac{207}{208}}}}}{\frac{\frac{\frac{\frac{209}{210}}{\frac{211}{212}}}{\frac{\frac{213}{214}}{\frac{215}{216}}}}{\frac{\frac{\frac{217}{218}}{\frac{219}{220}}}{\frac{\frac{221}{222}}{\frac{223}{224}}}}}}{\frac{\frac{\frac{\frac{\frac{225}{226}}{\frac{227}{228}}}{\frac{\frac{229}{230}}{\frac{231}{232}}}}{\frac{\frac{\frac{233}{234}}{\frac{235}{236}}}{\frac{\frac{237}{238}}{\frac{239}{240}}}}}{\frac{\frac{\frac{\frac{241}{242}}{\frac{243}{244}}}{\frac{\frac{245}{246}}{\frac{247}{248}}}}{\frac{\frac{\frac{249}{250}}{\frac{251}{252}}}{\frac{\frac{253}{254}}{\frac{255}{256}}}}}}}}}{...}=\sqrt{2}/2
- #include<cstdio>
- int s;
- FILE *f;
- void p(int i)
- {
- fprintf(f,"\\frac");
- if(!i)fprintf(f,"{%d}{%d}",s+1,s+2),s+=2;
- else fprintf(f,"{"),p(i-1),fprintf(f,"}{"),p(i-1),fprintf(f,"}");
- }
- int main()
- {
- f=fopen("d:\\frac.txt","w");
- fprintf(f,"\frac{"),p(7),fprintf(f,"}{...}=\sqrt{2}/2");
- fclose(f);
- return 0;
- }
复制代码
上述式子的极限值竟然恰好是$\sqrt{2}/2$,如何证明? |
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