以长为8,宽为6的矩形各边中点为顶点的四边形的周长为 .
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和|8b-5|互为相反数,则
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若3a+2b=2,则直线y=kx+b一定经过点( )
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如图△AOB中,∠AOB=120°,BD,AC是两条高,连接CD,若AB=4,则DC的长为( )
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