设C(x,0)
AC²=(x-2)²+(2-0)²=x²-4x+8
BC²=(x-5)²+(1-0)²=x²-10x+26
AC=BC
则:x²-4x+8=x²-10x+26
6x=18
x=3
所以,C的坐标为(3,0)