∵△ABC是等边三角形，∴∠ACB=60°，AC=BC，∵CD⊥BC，BC=CD，∴∠BCD=90°，∠BDC=45°，AC=CD，∴∠ACD=∠ACB+∠BCD=60°+90°=150°，∴∠DAC=∠ADC=180°−∠ACD2=180°−150°2=15°；∴∠ADB=∠BDC-∠ADC=45...