1.如图1,在△ABC中,AB=5,AC=3,AD是角平分线,求S△ABD:S△ACD.2.如图2,在△ABC中,AB=AC,D在BC上,且AD=BD,AC=CD,求∠B.3.如图3,已知△ABC是等边三角形,D是BC上任意一点,连接AD,并作等边△ADE,若DE⊥AB,试求BD:DC

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