四边形ABCD的四边AB,BC,CD,DA的长分别是a,b,c,d,且满足a2+b2+c2+d2=2ab+2cd,则这个四边形一定是A两组对角分别相等的四边形B平行四边形C对角线互相垂直的四边形D对角线长相等的四边形A两组对角分别
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![四边形ABCD的四边AB,BC,CD,DA的长分别是a,b,c,d,且满足a2+b2+c2+d2=2ab+2cd,则这个四边形一定是A两组对角分别相等的四边形B平行四边形C对角线互相垂直的四边形D对角线长相等的四边形A两组对角分别](/uploads/image/z/3963223-55-3.jpg?t=%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E5%9B%9B%E8%BE%B9AB%2CBC%2CCD%2CDA%E7%9A%84%E9%95%BF%E5%88%86%E5%88%AB%E6%98%AFa%2Cb%2Cc%2Cd%2C%E4%B8%94%E6%BB%A1%E8%B6%B3a2%2Bb2%2Bc2%2Bd2%3D2ab%2B2cd%2C%E5%88%99%E8%BF%99%E4%B8%AA%E5%9B%9B%E8%BE%B9%E5%BD%A2%E4%B8%80%E5%AE%9A%E6%98%AFA%E4%B8%A4%E7%BB%84%E5%AF%B9%E8%A7%92%E5%88%86%E5%88%AB%E7%9B%B8%E7%AD%89%E7%9A%84%E5%9B%9B%E8%BE%B9%E5%BD%A2B%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2C%E5%AF%B9%E8%A7%92%E7%BA%BF%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%E7%9A%84%E5%9B%9B%E8%BE%B9%E5%BD%A2D%E5%AF%B9%E8%A7%92%E7%BA%BF%E9%95%BF%E7%9B%B8%E7%AD%89%E7%9A%84%E5%9B%9B%E8%BE%B9%E5%BD%A2A%E4%B8%A4%E7%BB%84%E5%AF%B9%E8%A7%92%E5%88%86%E5%88%AB)
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