∵∠B=42°
∴∠BAC+∠ACB=138°
∵∠BAC+∠CAE=180°
∠ACB+∠ACF=180°
∴∠CAE+∠ACF=360°-138°=222°
∵AD平分∠CAE,CD平分∠ACF
∴∠CAD+∠ACD=½×222°=111°
∴∠ADC=180°-111°=69°
∵∠B=42°
∴∠BAC+∠ACB=138°
∵∠BAC+∠CAE=180°
∠ACB+∠ACF=180°
∴∠CAE+∠ACF=360°-138°=222°
∵AD平分∠CAE,CD平分∠ACF
∴∠CAD+∠ACD=½×222°=111°
∴∠ADC=180°-111°=69°