北师大版数学七上47有趣的七巧板同步测试内容摘要:
诙谐的解 说词,例如. 7.如图 7,用一块边长为 2 2 的正方形 ABCD厚纸板,按照下面的作法,做了一套七巧板:作对角线 AC,分别取 AB、 BC中点 E、 F,连结 EF;作 DG⊥ EF于 G,交 AC 于 H;过 G作 GL∥ BC,交 AC于 L,再由 E作 EK∥ DG,交 AC于 K;将正方形 ABCD沿画出的线剪开,现用它拼出一座桥(如图),这座桥的阴影部分的面积是(。北师大版数学七上47有趣的七巧板同步测试
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