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  3. The figure above represents the surface of a wall with an irregular shape, where all measurements are in meters and point

The figure above represents the surface of a wall with an irregular shape, where all measurements are in meters and point

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问题
The figure above represents the surface of a wall with an irregular shape, where all measurements are in meters and point
选项 A、8＜x＜9
B、9＜x＜10
C、10＜x＜11
D、11＜x＜12
E、12＜x＜13
答案A
解析 如图，PQDA的面积为(10+20)×10+2=150平方米，故油漆能刷至PQ线右侧。x=11时，面积为150+(10+10.5)×1/2=160.25平方米；x=12时，面积为150+(10+11)×1/2=170.5平方米。故11＜x＜12答案为D。
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