Question

Giúp mk vs ạ.

Answer 1

Áp dụng đ/l Ta-lét ta có :

\(\Rightarrow\dfrac{AM}{AB}=\dfrac{AN}{AC}\Leftrightarrow\dfrac{2}{10}=\dfrac{AN}{15}\)

\(\Rightarrow AN=\dfrac{2.15}{10}=3\left(cm\right)\)

hoặc \(AN=\dfrac{1}{5}.15=3\left(cm\right)\)

Answer 2

Xét ΔABC có MN//BC

nên AM/AB=AN/AC

=>2/10=AN/15

=>AN/15=1/5

hay AN=3(cm)

=>NC=15-3=12(cm)

Answer 3

Tham khảo

Xét ΔABC có MN//BC

nên AM/AB=AN/AC

=>2/10=AN/15

=>AN/15=1/5

hay AN=3(cm)

=>NC=15-3=12(cm)