解析(1)AB∥CD證明:∵∠BDE=∠AEF∴EC∥BD,∠EAB=∠B,∵∠B=∠C,∴∠EAB=∠C,∴AB∥CD(2)∵∠EFB的補角比∠FDC的餘角小10°∴∠EFD+10°=90°﹣∠FDC,∵AB∥CD∴∠BFD=∠FDC,∴...
Read more解析(1)AB∥CD證明:∵∠BDE=∠AEF∴EC∥BD,∠EAB=∠B,∵∠B=∠C,∴∠EAB=∠C,∴AB∥CD(2)∵∠EFB的補角比∠FDC的餘角小10°∴∠EFD+10°=90°﹣∠FDC,∵AB∥CD∴∠BFD=∠FDC,∴...
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