圆:x² + y² +4x - 2y -4 = 0x² + 4x + 4 -4 + y² - 2y + 1 -1 -4 =0(x+2)² + (y-1)² = 9 (1)y = -x -4y -1 = -x -5 (2)(2)代入 (1),x² + 7x + 10 = 0,(x+5)(x+2) = 0x1 = -5,y1 ...