论文部分内容阅读
题目:设点D在△ABC的边BC上,且分BC为m∶n.求证:nAB+mAC>(m+n)AD. 证明:如图(1),引BE∥AC交直线AD于
Title: Set point D on the side BC of △ABC, and divide BC into m:n. Proof: nAB+mAC>(m+n)AD. Proof: As shown in figure (1), lead the intersection of BE and AC.