∵∠ABD=20°，∠BDC=80°，∴∠A=∠BDC-∠ABD=60°，∵BD是∠B的平分线，∠ABD=20°，∴∠ABC=2∠ABD=40°，∴∠ACB=180°-60°-40°=80°，∵CE平分∠ACB，∴∠BCE=12∠ACB=40°，∴∠AEC=∠ABC+∠BCE=40°+40°=8...