过D作DG∥AC交BF于G,
∵E是AD的中点,
∴△AEF≌△DEG,
∴DG=AF,
∵DG∥AC,BD:DC=5:3,
∴DG:CF=5:8,
∴AF:CF=5:8,
∴AF:AC=5:13.
如图,在△ABC中,D为边BC上一点,已知BD/DC=5/3,E为AD的中点,延长BE交AC于F,求AF/AC的值.
如图,在△ABC中,D为边BC上一点,已知
=
,E为AD的中点,延长BE交AC于F,求
的值.
BD |
DC |
5 |
3 |
AF |
AC |
数学人气:139 ℃时间:2020-05-21 02:09:33
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