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1例题三角形的内角平分线分对边成两段的长度比等于夹角两边长度的比.已知:如图,AD是△ABC的角平分线.求证:BD/DC=AB/AC.1.1背景分析
The ratio of the lengths of the two sides of an internal corner bisecting one side of the triangle to the other is equal to the ratio of the lengths of the two sides of the included angle. It is known that, as shown in the figure, AD is the bisector of the angle ABC. Verification: BD / DC = AB / AC.1.1 background analysis