共50条信息
如图,\(AB\parallel DE\),若\(AC=4\),\(BC=2\),\(DC=1\),则\(EC=\)_________\(.\)
如图,\(AB/\!/CD\),\(AB=\dfrac{1}{2}CD\),\(S_{\triangle ABO}\) :\(S_{\triangle CDO}=\)____.
如图,在\(\triangle ABC\)中,\(D\),\(E\)分别是\(AB\),\(AC\)上的点,\(DE/\!/BC\),若\(AD=1\),\(BD=3\),则\(\dfrac{DE}{BC}\)的值为________.
如图,在\(\triangle ABC\)中,\(DE/\!/AB\),\(DE\)分别与\(AC\),\(BC\)交于\(D\),\(E\)两点\(.\)若\(\dfrac{{{S}_{\vartriangle DEC}}}{{{S}_{\vartriangle ABC}}}=\dfrac{4}{9}\), \(AC=3\),则\(DC=\)___.
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