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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: $\triangle$ ABC $\text{;}$ D $\in$ sao cho $\dfrac{BD}{BC}$ = $\dfrac{1}{4}$ $\text{;}$ E $\in$ AD. Sao cho $\text{AE = 2.ED}$. Gọi K l

Toán Lớp 8: $\triangle$ ABC $\text{;}$ D $\in$ sao cho $\dfrac{BD}{BC}$ = $\dfrac{1}{4}$ $\text{;}$ E $\in$ AD. Sao cho $\text{AE = 2.ED}$. Gọi K là giao điểm BE và AC. Tính $\dfrac{AK}{KC}$
$\textit{Lưu ý: Các bạn giải áp dụng định lý Ta – lét nhoe!!}$

Comments ( 1 )

  1.  Từ D kẻ $DV//BK$

    \triangle BKC có : $DV//BK$

    -> (KV)/(KC) = (BD)/(BC)=1/4

    \triangle ADV có : $EK//DV$

    -> (AK)/(KV)=(AE)/(ED)=2

    (KV)/(KC) . (AK)/(KV)=1/4 . 2 = 1/2

    -> (AK)/(KC)=1/2

    toan-lop-8-triangle-abc-tet-d-in-sao-cho-dfrac-bd-bc-dfrac-1-4-tet-e-in-ad-sao-cho-tet-ae-2-ed-g

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222-9+11+12:2*14+14 = ? ( )