Question

\(\frac{0,2x317x7+0,14x3520+33,1x14}{2+5+8+....+65-387}\)

Answer 1

\(BH=\frac{AB.AC}{BC}=\frac{3.4}{5}=\frac{12}{5}=2,4\)

Trung tuyến ứng với cạnh huyền bằng nửa cạnh huyền => MC = 2,5

\(S_{BMC}=\frac{1}{2}MC.BH=3\left(cm^2\right)\)

\(AH=\frac{AB^2}{AC}=\frac{9}{5}=1,8\left(cm\right)\)

\(S_{ABH}=\frac{1}{2}AH.BH=2,16\left(cm^2\right)\)

BK là TPG 

\(\frac{AK}{AB}=\frac{KC}{BC}=\frac{AK+KC}{AB+BC}=\frac{5}{7}\)

\(KC=\frac{20}{7}\left(cm\right)\)

\(KM=KC-MC=\frac{20}{7}-2,5=\frac{5}{14}\)

\(S_{BKM}=\frac{1}{2}BH.KM=\frac{3}{7}\)

\(S_{BHK}=S_{ABC}-S_{BKM}-S_{BMC}-S_{BHA}=\frac{72}{175}\)