C(a,0)若AC=BC则AC²=BC²(a+3)²+(0+2)²=(a-1)²+(0-4)²a=1/2若AC=AB则(a+3)²+(0+2)²=(-3-1)²+(-2-4)²a²+6a-39=0a=-3±4√3若BC=AB则(a-1)²+(0-4)²=...那我加