圆(x－2)²＋(y－2)²＝(3√2)²圆心(2,2),半径3√2|2a＋2b|/√(a²＋b²)≤√2∴(a/b)²＋4(a/b)＋1≤0∴－2－√3≤a/b≤－2＋√3,k＝－a/b∴2－√3≤k≤2＋√3∴倾斜角取值范围：[π/12,5...