求解一道几何题.如图所示,体型ABCD中,AD//BC,M是AB的中点,DM平分∠ADC,CM平分∠BCD.求证:(1)S(1)S△DMC=1/2S梯形ABCD (2)DC=AD+BC
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![求解一道几何题.如图所示,体型ABCD中,AD//BC,M是AB的中点,DM平分∠ADC,CM平分∠BCD.求证:(1)S(1)S△DMC=1/2S梯形ABCD (2)DC=AD+BC](/uploads/image/z/9457149-21-9.jpg?t=%E6%B1%82%E8%A7%A3%E4%B8%80%E9%81%93%E5%87%A0%E4%BD%95%E9%A2%98.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E4%BD%93%E5%9E%8BABCD%E4%B8%AD%2CAD%2F%2FBC%2CM%E6%98%AFAB%E7%9A%84%E4%B8%AD%E7%82%B9%2CDM%E5%B9%B3%E5%88%86%E2%88%A0ADC%2CCM%E5%B9%B3%E5%88%86%E2%88%A0BCD.%E6%B1%82%E8%AF%81%EF%BC%9A%EF%BC%881%EF%BC%89S%EF%BC%881%EF%BC%89S%E2%96%B3DMC%3D1%2F2S%E6%A2%AF%E5%BD%A2ABCD+%EF%BC%882%EF%BC%89DC%3DAD%2BBC)
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