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KenCheng

可否教我b題點解?

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解答 0

  • eric
    2019-11-28 22:21:00
    First prove AH:HE=2:1
  • eric
    2019-11-28 22:25:13
    Then prove area of ∆AEF:area of ∆AHF=3:2
  • eric
    2019-11-28 22:28:02
    Correction:Then prove area of ∆AEF:area of ∆HEF=3:1
    •  eric 2019-11-28 22:25:13
    • Then prove area of ∆AEF:area of ∆AHF=3:2
  • eric
    2019-11-28 22:30:32
    Finally you can conclude the ratio in question is 2:1
  • eric
    2019-11-28 22:34:45
    More simply, after you have proved AH:HE=2:1, you can conclude directly the ratio in question is also 2:1
  • KenCheng
    2019-11-29 23:43:49
    是否这样?

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    •  eric 2019-11-28 22:34:45
    • More simply, after you have proved AH:HE=2:1, you can conclude directly the ratio in question is also 2:1
  • eric
    2019-11-30 00:15:40
    最後三個部驟不知你在做甚麽。
  • eric
    2019-11-30 00:22:56
    得出HE:AH=1:2後,可設HE=k,AH=2k。 所求面積比例 =2k×EF/2:k×EF/2 =2:1
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