已知实数 a、b、c满足
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022165120090611987/SYS201310221651200906119010_ST/0.png)
,那么abc的值为
.
考点分析:
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如图,△ABC中,∠ACB=90°,∠B=30°,AC=1,过点C作CD
1⊥AB于D
1,过D
1作D
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2⊥BC于D
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2作D
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3⊥AB于D
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C.
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