摘要：23． 解:(1)四边形是正方形．······················· 1分 证明:四边形是正方形. . . ．··································· 2分 ．········ 3分 ．··································· 4分 四边形是菱形．····································· 5分 由知． . ． ．········································································································ 6分 四边形是正方形．························································································· 7分 (2)1．····················································································································· 10分

网址：http://m.1010jiajiao.com/timu_id_2042144[举报]