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某市2016年秋学期高二数学期末检测填空压轴题14:已知直线ax+by+c=0始终平分圆C:x2+y2-2x+4y-4=0(C为圆心)的周长,过点P(6,9)作直线l:(2a-b)x+(2b-c)y+(2c-a)=0的垂线,垂足为H,则线段CH长度的取值范围是_______.阅卷后的统计显示,本题得分率太低,一所四星级学校平均得分率不足3%,引起我们的高度重视,需要认真反思.
City 2016 autumn semester sophomore mathematics at the end of the test to fill in the air pressure axis problem 14: Known straight line ax + by + c = 0 always bisecting circle C: x2 + y2-2x + 4y-4 = 0 (C is the center of the circle) Point P (6,9) for the vertical line l: (2a-b) x + (2b-c) y + (2c-a) = 0 vertical line, the foot is H, the length of the line segment CH range _______ After reading the statistics show that the problem scoring rate is too low, a four-star school average score of less than 3%, aroused our attention, you need to seriously reflect on.