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如图,由8个大小相等的小正方形构成“L”型图案,它的四个顶点E,F,G,H分别在...
如图,由8个大小相等的小正方形构成“L”型图案,它的四个顶点E,F,G,H分别在矩形的边AB,BC,CD,DA上,若AB=a,AB:BC=sin45°,则DG=
.
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的解是
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