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如图,已知四边形ABCD的对角线AC=BD,AC⊥BD,四边形A1B1C1D1的...
如图,已知四边形ABCD的对角线AC=BD,AC⊥BD,四边形A
1B
1C
1D
1的四个顶点A
1、B
1、C
1、D
1分别为AB、BC、CD、DA的中点,四边形A
2B
2C
2D
2的四个顶点A
2、B
2、C
2、D
2分别为A
1B
1、B
1C
1、C
1D
1、D
1A
1的中点,如果AC=2a,那么S
四边形AnBnCnDn=
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230757349986678/SYS201310212307573499866006_ST/images0.png)
考点分析:
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