It is known that in the triangle ABC, D and E are points on AB and AC respectively, and de / / BC, be and CD intersect at point O, and the extension line of Ao intersects with BC at point M=

It is known that in the triangle ABC, D and E are points on AB and AC respectively, and de / / BC, be and CD intersect at point O, and the extension line of Ao intersects with BC at point M=

Draw a graph: in the triangle ABC, D and E are the points on AB and AC respectively, and de / / BC, be and CD intersect at point O, the extension line of Ao intersects with BC at point m, and de intersects at point n. let AB = C, AC = B, BC = a, AD / AB = k, then ad = k * C, de = k * a; let DN = P, then ne = k * A-P, and am = y. from de / / BC, we can get ∽ Deo ∽ CBO, and EO