∠A'EA+∠A'DA=360-（α+α）=360-2α
∠1+∠2=（180-∠A'EA）+（180-∠A'DA）=2α=2∠A
如图所示,把一张三角形纸片ABC沿DE折叠,点A落在四边形BCED的内部（1）若∠A=α时,求∠1+∠2
如图所示,把一张三角形纸片ABC沿DE折叠,点A落在四边形BCED的内部（1）若∠A=α时,求∠1+∠2
数学人气：584 ℃时间：2019-11-24 00:02:56
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