小学数学五年级上册一个直角三角形中空白为正方形,求阴影的面积直角三角形ABC,B是直角,AB之间有一点D,AC之间有一点E,BC之间有一点F,DEFB为正方形,求三角形ADE和三角形EFC的面积,AE边12CM,EC边18C
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![小学数学五年级上册一个直角三角形中空白为正方形,求阴影的面积直角三角形ABC,B是直角,AB之间有一点D,AC之间有一点E,BC之间有一点F,DEFB为正方形,求三角形ADE和三角形EFC的面积,AE边12CM,EC边18C](/uploads/image/z/8658582-6-2.jpg?t=%E5%B0%8F%E5%AD%A6%E6%95%B0%E5%AD%A6%E4%BA%94%E5%B9%B4%E7%BA%A7%E4%B8%8A%E5%86%8C%E4%B8%80%E4%B8%AA%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%AD%E7%A9%BA%E7%99%BD%E4%B8%BA%E6%AD%A3%E6%96%B9%E5%BD%A2%2C%E6%B1%82%E9%98%B4%E5%BD%B1%E7%9A%84%E9%9D%A2%E7%A7%AF%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2ABC%2CB%E6%98%AF%E7%9B%B4%E8%A7%92%2CAB%E4%B9%8B%E9%97%B4%E6%9C%89%E4%B8%80%E7%82%B9D%2CAC%E4%B9%8B%E9%97%B4%E6%9C%89%E4%B8%80%E7%82%B9E%2CBC%E4%B9%8B%E9%97%B4%E6%9C%89%E4%B8%80%E7%82%B9F%2CDEFB%E4%B8%BA%E6%AD%A3%E6%96%B9%E5%BD%A2%2C%E6%B1%82%E4%B8%89%E8%A7%92%E5%BD%A2ADE%E5%92%8C%E4%B8%89%E8%A7%92%E5%BD%A2EFC%E7%9A%84%E9%9D%A2%E7%A7%AF%2CAE%E8%BE%B912CM%2CEC%E8%BE%B918C)
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