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如图,直径分别为CD、CE的两个半圆相切于点C,大半圆M的弦与小半圆N相切于点F...
如图,直径分别为CD、CE的两个半圆相切于点C,大半圆M的弦与小半圆N相切于点F,且AB∥CD,AB=4,设
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、
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164357460639742/SYS201310221643574606397017_ST/1.png)
的长分别为x、y,线段ED的长为z,则z(x+y)的值为
.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164357460639742/SYS201310221643574606397017_ST/images2.png)
考点分析:
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