图是这样的吗?∵∠A=40º,∠B=72º∴∠ACB=68º∵CE平分∠ACB∴∠ACE=34º∴∠FED=∠ACE+∠A=74º∵DF⊥CE,CD⊥AB∴∠DFE=∠CDE=90º∴∠FED+∠ECD=90º=∠CDF+∠ECD∴∠CDF=∠FED=74&#...恩嗯