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∠3:∠D:∠B=2:3:4∠D=1.5∠3∠B=2∠3FC平行AB∠2+∠B=180∠2+2∠3=180FC平行DE∠1+∠D=180∠1+1.5∠3=180∠2+2∠3+∠1+1.5∠3=360(∠1+∠2+∠3)+2.5∠3=360 180+2.5∠3=360∠3=72∠D=108∠B=144…
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