如图,已知△ABC中,DE//FG//BC,AD:DF:FB=2:3:4,求S△ADE:S四边形DEGF:S四边形FGC
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如图,已知△ABC中,DE//FG//BC,AD:DF:FB=2:3:4,求S△ADE:S四边形DEGF:S四边形FGCB=?
由题意,
因为,AD:DF:FB=2:3:4
所以,AD:AF:AB=2:5:9
所以,S△ADE:S△AFG:S△ABC
=AD^2:AF^2:AB^2
=4:25:81
S△ADE:S四边形DEGF:S四边形FGCB
=S△ADE:(S△AFG-S△ADE):(S△ABC-S△AFG)
=4:21:56
因为,AD:DF:FB=2:3:4
所以,AD:AF:AB=2:5:9
所以,S△ADE:S△AFG:S△ABC
=AD^2:AF^2:AB^2
=4:25:81
S△ADE:S四边形DEGF:S四边形FGCB
=S△ADE:(S△AFG-S△ADE):(S△ABC-S△AFG)
=4:21:56
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