设BC交Y轴于D直线BC表达式为Y=KX+B代入（1,0）、（-3,-2）K+B=0-3K+B=-24K=2,K=1/2B=-1/2所以直线为Y=X/2-1/2代入X=0,Y=-1/2所以D点坐标（0,-1/2）AD=7/2S△ABD=1/2×7/2×1=7/4S△ACD=1/2×7/2×3=21/4S△ABC=S△AB...