∵EC=2BE∴BE=1/3BC∴数腔滚S△圆穗ABE=1/3S△ABC=1/3×18=6∵D是中点∴AD=1/2AC∴S△ABD=1/2S△ABC=1/2×18=9∴S△ABD-S△薯余ABE=9-6=3
=S△AEC-S△BDC=12-9=3
图高誉唯戚培片虚局:
SΔADF-SΔBEF=SΔABF-SΔABE