如图,已知∠BED=∠B+∠D试说明 AB//CD过点E坐∠BEF=∠B所以_____//____ ( )因为∠BED=∠B+∠D ( )∠BEF=∠B(已作)所以∠____=_____(等式性质)所以_____//_____ ( )又因为_____//______( )所以_____/

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