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Natural are like natural plants that need pruning by study. (ability)
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如图在Rt△ABC中∠ACB=90°点DEF分别是边ABACAD的中点若AB=6则EF=
如图在长为32m宽为20m的矩形地面上修筑同样宽的道路图中阴影部分剩余的空地上种植草坪.要使草坪的面积为540m2求道路的宽.
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