若为不等式组表示的平面区域,则当从-2连续变化到1时,动直线 

为不等式组表示的平面区域,则当从-2连续变化到1时,动直线 扫过中的那部分区域的面积为     

答案


解析:

如图知区域的面积是△OAB去掉一个

小直角三角形。

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