x²+y²-4x+4y+4=0(x-2)²+(y+2)²=4所以圆心C（2,-2）,半径r=2圆心C到直线x-y-5=0的距离d=|2+2-5|/√(1²+1²) =1/√2 =√2 /2所以弦长=2×√[r²d²] =2×√(2...