(1)已知MN是△ABC的中线,∠C=90°,MN⊥AB,垂足为点N,问AN²-BN²=AC²吗?请说明理由(2)四边形ABCD中,∠B=90°,AB=12,BC=9,CD=8,AD=17,求四边形ABCD面积
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![(1)已知MN是△ABC的中线,∠C=90°,MN⊥AB,垂足为点N,问AN²-BN²=AC²吗?请说明理由(2)四边形ABCD中,∠B=90°,AB=12,BC=9,CD=8,AD=17,求四边形ABCD面积](/uploads/image/z/2740005-45-5.jpg?t=%EF%BC%881%EF%BC%89%E5%B7%B2%E7%9F%A5MN%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%AD%E7%BA%BF%2C%E2%88%A0C%3D90%C2%B0%2CMN%E2%8A%A5AB%2C%E5%9E%82%E8%B6%B3%E4%B8%BA%E7%82%B9N%2C%E9%97%AEAN%26%23178%3B-BN%26%23178%3B%3DAC%26%23178%3B%E5%90%97%3F%E8%AF%B7%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1%EF%BC%882%EF%BC%89%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E2%88%A0B%3D90%C2%B0%2CAB%3D12%2CBC%3D9%2CCD%3D8%2CAD%3D17%2C%E6%B1%82%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E9%9D%A2%E7%A7%AF)
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