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rongtruong26012002
2 năm trước
Cho ` ΔABC`.Lấy : `M∈AB` đẻ `MA=2MB` `N∈BC` đẻ `CN=3BN` `P∈AC` đẻ `AP=3CP` Cho `D,E,F` là giao của `AN,BP,CM`. Tính `S_{DEF}=???` biết `S_{ABC}=10cm^2`
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