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如图,等腰△ABC中,底边BC=a,∠A=36°,∠ABC的平分线交AC于D,∠...
如图,等腰△ABC中,底边BC=a,∠A=36°,∠ABC的平分线交AC于D,∠BCD的平分线交BD于E,设k=
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,则DE=( )
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A.k
2a
B.k
3a
C.
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D.
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