圆x^2+y^2+2x+2y-3=0上到直线4x-3y=2的距离为根号2的点数共有几个
人气：178 ℃ 时间：2019-12-17 07:30:19
解答
(x+1)²+(y+1)²=5
圆心(-1,-1),半径r=√5
圆心到直线距离d=|-4+3-2|/√(4²+3²)=3/5
因为d+√2
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