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(2008•温州)如图,点A1,A2,A3,A4在射线OA上,点B1,B2,B3...
(2008•温州)如图,点A
1,A
2,A
3,A
4在射线OA上,点B
1,B
2,B
3在射线OB上,且A
1B
1∥A
2B
2∥A
3B
3,A
2B
1∥A
3B
2∥A
4B
3.若△A
2B
1B
2,△A
3B
2B
3的面积分别为1,4,则图中三个阴影三角形面积之和为
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230619152151932/SYS201310212306191521519014_ST/images0.png)
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