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(2007•临沂)如图,某厂有许多形状为直角梯形的铁皮边角料,为节约资源,现要按...
(2007•临沂)如图,某厂有许多形状为直角梯形的铁皮边角料,为节约资源,现要按图中所示的方法从这些边角料上截取矩形(阴影部分)片备用,当截取的矩形面积最大时,矩形两边长x、y应分别为( )
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A.x=10,y=14
B.x=14,y=10
C.x=12,y=15
D.x=15,y=12
考点分析:
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