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1.求的取值范围. 解,则建立a-O-b坐标系,则原题转化为求直线b=-a+y与单位圆a2+b2=1在第Ⅰ象限(包含图1坐标轴)内有公共点时,直线在b轴上的截距的
1. The range of values to be solved. The solution is to establish the aOb coordinate system. Then the original question is converted into the seeking line b=-a+y and the unit circle a2+b2=1 in the first quadrant (including the coordinate axis of Figure 1). At the common point, the intercept of the line on the b-axis