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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