如图1.已知,AB=CD=AE=BC+DE=2,∠ABC=∠AED=90°,求五边形ABCDE的面积如图2.AD是△ABC的中线,E.F分别在AB.AC上,且DE⊥DF,求证BE+CF>EF分解因式 (x-2y)^2-4(x-2y-1)x^2-4xy-12y^2-8y-1多项式5x^2-4xy+4y^2+12x+27有最——
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![如图1.已知,AB=CD=AE=BC+DE=2,∠ABC=∠AED=90°,求五边形ABCDE的面积如图2.AD是△ABC的中线,E.F分别在AB.AC上,且DE⊥DF,求证BE+CF>EF分解因式 (x-2y)^2-4(x-2y-1)x^2-4xy-12y^2-8y-1多项式5x^2-4xy+4y^2+12x+27有最——](/uploads/image/z/2831849-17-9.jpg?t=%E5%A6%82%E5%9B%BE1.%E5%B7%B2%E7%9F%A5%2CAB%3DCD%3DAE%3DBC%2BDE%3D2%2C%E2%88%A0ABC%3D%E2%88%A0AED%3D90%C2%B0%2C%E6%B1%82%E4%BA%94%E8%BE%B9%E5%BD%A2ABCDE%E7%9A%84%E9%9D%A2%E7%A7%AF%E5%A6%82%E5%9B%BE2.AD%E6%98%AF%E2%96%B3ABC%E7%9A%84%E4%B8%AD%E7%BA%BF%2CE.F%E5%88%86%E5%88%AB%E5%9C%A8AB.AC%E4%B8%8A%2C%E4%B8%94DE%E2%8A%A5DF%2C%E6%B1%82%E8%AF%81BE%2BCF%EF%BC%9EEF%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F+%EF%BC%88x-2y%EF%BC%89%5E2-4%28x-2y-1%29x%5E2-4xy-12y%5E2-8y-1%E5%A4%9A%E9%A1%B9%E5%BC%8F5x%5E2-4xy%2B4y%5E2%2B12x%2B27%E6%9C%89%E6%9C%80%E2%80%94%E2%80%94)
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