hinh hoc lop 8 de day

N

nguyenbahiep1

[TEX]BC = 35 cm \\ \frac{DB}{AB} = \frac{DC}{AC} = \frac{BC}{AB+AC} \\ \frac{15}{AB} = \frac{20}{AC} = \frac{35}{AB+AC} \\3AB = 4AC\\ AB^2 +AC^2 = 35^2 \Rightarrow AB = 21 cm\\ AC = 28cm[/TEX]
 
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