解一道数学平面几何动点问题.如图所示,在梯形ABCD中,AD∥BC,E是BC的中点,AD=5,BC=12,CD=4√2(4倍根号2),∠C=45º,点P是BC边上一动点,设BP的长为x.问:(1)当x的值为( )时,以点P、A、D、E、为
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![解一道数学平面几何动点问题.如图所示,在梯形ABCD中,AD∥BC,E是BC的中点,AD=5,BC=12,CD=4√2(4倍根号2),∠C=45º,点P是BC边上一动点,设BP的长为x.问:(1)当x的值为( )时,以点P、A、D、E、为](/uploads/image/z/7625418-42-8.jpg?t=%E8%A7%A3%E4%B8%80%E9%81%93%E6%95%B0%E5%AD%A6%E5%B9%B3%E9%9D%A2%E5%87%A0%E4%BD%95%E5%8A%A8%E7%82%B9%E9%97%AE%E9%A2%98.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%E2%88%A5BC%2CE%E6%98%AFBC%E7%9A%84%E4%B8%AD%E7%82%B9%2CAD%3D5%2CBC%3D12%2CCD%3D4%E2%88%9A2%EF%BC%884%E5%80%8D%E6%A0%B9%E5%8F%B72%EF%BC%89%2C%E2%88%A0C%3D45%26%23186%3B%2C%E7%82%B9P%E6%98%AFBC%E8%BE%B9%E4%B8%8A%E4%B8%80%E5%8A%A8%E7%82%B9%2C%E8%AE%BEBP%E7%9A%84%E9%95%BF%E4%B8%BAx.%E9%97%AE%EF%BC%9A%EF%BC%881%EF%BC%89%E5%BD%93x%E7%9A%84%E5%80%BC%E4%B8%BA%EF%BC%88+%EF%BC%89%E6%97%B6%2C%E4%BB%A5%E7%82%B9P%E3%80%81A%E3%80%81D%E3%80%81E%E3%80%81%E4%B8%BA)
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