如图,在山顶A处望见一艘飞艇停留在湖面上空(100+50
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825771526638/SYS201310221648257715266015_ST/0.png)
)米处,观察到飞艇底部标志P处的仰角为45°,又观其湖中之像的俯角为60°,试求山高h(观察时湖面处于平静状态).
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已知△ABC的三边长分别为a、b、c,面积为S;△DEF的三边长分别为d、e、f,面积为M,且a>d,b>e,c>f,则S和M的关系为( )
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如图是一次函数
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A.
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B.
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D.|am|
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设a=
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-1,c=
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已知点P的坐标为(x,y)且
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A.(-1,
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