vẽ hình nữa với ạ
\(\dfrac{AM}{AC}=\dfrac{AM}{AK}.\dfrac{AK}{AC}=\dfrac{AI}{AB}.\dfrac{AK}{AC}\)
\(\dfrac{AN}{AB}=\dfrac{AN}{AI}.\dfrac{AI}{AB}=\dfrac{AK}{AC}.\dfrac{AI}{IB}\)
\(\Rightarrow\dfrac{AM}{AC}=\dfrac{AN}{AB}\Rightarrow\)MN//AB.
Đúng 0
Bình luận (2)
