解方程:
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考点分析:
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如图,在锐角△ABC中,高CD、BE相交于点H,则图中所有与△CEH相似(除△CEH自身外)的三角形的个数是( )
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A.1个
B.2个
C.3个
D.4个
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如图,Rt△ABC中,∠ACB=90°,CD⊥AB,D为垂足,若AC=8,AB=10,则sin∠ACD的值为( )
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A.
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B.
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C.
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D.
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某印刷厂十月份印书40万册,十二月份印书60万册,求平均每月的增长率 (精确到1%).若设平均每月的增长率为 x,则依题意,可列出方程是( )
A.40(1+x)=60
B.40(1+x)
2=60
C.40(1+x)
3=60
D.40+40(1+x)+40(1+x)
2=60
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下列方程组中,二元二次方程组是( )
A.
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B.
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C.
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D.
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已知等腰梯形的一条较短的底边长为6cm,较长的底边的一个底角的正弦值为
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,梯形高为9cm,那么这个等腰梯形的较长的底边长
cm.
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