设圆心(a,0),a>乎闷0则半径r=|a-1|圆心到L距离是|a-0-1|/√(1²+1²)=r/√2弦长2√2则由勾股定理r²=(r/√2)²+(2√2/岁咐弯2)²=r²/2+2r²=4|a-1|=r=2a>0所以a=3所以圆心(3,0)处置L则简拍斜率=-1/1=-1所以是x+y-3=0
y=3-x