a/ xét 2 tam giác đói có : \(\frac{AE}{AC}=\frac{AD}{AB}\Leftrightarrow\frac{AE}{AD}=\frac{AC}{AB}\), chung góc A

\(\Rightarrow\Delta AEC\sim\Delta ADB\left(c-g-c\right)\)

b/ xét 2 tam giác đó có: \(\frac{AE}{AC}=\frac{AD}{AB}\), chung góc A

\(\Rightarrow\Delta AED\sim\Delta ACB\left(c-g-c\right)\)

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