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[数学故事]狐狸买葱与数学
2016-11-21

  HULIQUEZHETUIYIGUAIYIGUAIDIZOUZHE,XINLIZHUOMOZHEZENYANGCAINENGFACAI。

  QUETUIHULIKANJIANLAOSHANYANGZAIMAIDACONG,ZOUGUOQUWEN:“LAOSHANYANG,ZHEIDACONGZENYANGMAIFA?GONGYOUDUOSHAOCONGA?”LAOSHANYANGSHUO:“1QIANKECONGMAI1YUANQIAN,GONGYOU100QIANKE。”QUETUIHULIYANZHUYIZHUAN,WEN:“NIZHEICONG,CONGBAIDUOSHAO,CONGYEYOUSHIDUOSHAOYA?”LAOSHANYANGPOBUNAIFANDISHUO:“YIKEDACONG,CONGBAIZHAN20%,QIYU80%DOUSHICONGYE。”QUETUIHULIBAIZHEZHITOUSUANLESUAN,SHUO:“CONGBAINA,1QIANKEWOJINI7JIAOQIAN。CONGYENA,1QIANKEJINI3JIAO。7JIAOJIA3JIAOZHENGHAODENGYU1YUAN,XINGMA?”   

  LAOSHANYANGXIANGLEXIANG,JUEDEHULISHUODEYEYOUDAOLI,JIUDAYINGMAIJITALE。

  狐狸笑了笑,开始算钱了。狐狸先列了个算式:0.7×20+0.3×80=14+24=38(元),然后说:“100千克大葱,葱白占20%,就是20千克。葱白1千克7角钱,总共是14元;葱叶占80%,就是80千克,1千克3角钱,总共是24元。合在一起是38元。对不对?”老山羊算了半天,也没算出个数来,只好说:“你算对了就行。” “我狐狸从不蒙人!给你38元,数好啦!”狐狸把钱递给了老山羊。

  LAOSHANYANGMAIWANCONGWANGJIAZOU,ZONGJUEDEZHEIQIANHAOXIANGSHAOLEDIAN,KESHISHAOZAINAERNI?XIANGBUCHULAI。TADITOUKANJIANXIAOYANSHUCONGDILIZUANLECHULAI。TARANGXIAOYANSHUBANGMANGSUANSUANZHEIBIZHANG。XIAOYANSHUSHUO:“NIYUANLAIDACONGSHI1QIANKEMAI1YUAN。NIYOU100QIANKE,YINGGAIMAI100YUANCAIDUI,QUEHULIZENMEZHIJINI38YUANNI?”   

德甲竞猜 LAOSHANYANGDIANLEDIANTOU,ZHIDAOZIJICHIKUILE。KESHITABUMINGBAI,ZIJISHIZENYANGCHIDEKUI?YANSHUSHUO:“HULIJINI1QIANKECONGBAI7JIAO,1QIANKECONGYE3JIAO,HEQILAISUANSHI2QIANKECAI1YUANQIAN,ZHEINIYIJINGCHIYIBANKUILE。”   

德甲竞猜   LAOSHANYANGWEN:“CHIYIBANKUI,WOYEYINGGAIDE50YUANCAIDUI,ZENMEZHIDE38YUANNI?”   

  YANSHUXIELEYIGESUANSHI:   

德甲竞猜   (1-0.7)×20+(1-0.3)×80=6+56=62(YUAN)。

  “NI1QIANKECONGBAICHIKUI0.3YUAN,20QIANKECHIKUI6YUAN;1QIANKECONGYECHIKUI0.7YUAN,80QIANKECHIKUI56YUAN,HEQILAIZHENGHAOSHAOMAILE62YUAN。”   

德甲竞猜   LAOSHANYANGDIAOTOUJIUWANGHUIPAO,KANJIANHULIZHENGZAIMAICONG,MEIQIANKEMAI2YUAN。LAOSHANYANGERHUAMEISHUO,YIDITOU,YONGYANGJIAODINGZHUQUETUIHULIDEHOUYAO,YIZHIBATADINGJINLESHUITANGLI。


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