网址:http://m.1010jiajiao.com/timu_id_660554[举报]
a2+b2与2a+2b-2的大小关系是 ( )
(A)a2+b2>2a+2b-2 (B)a2+b2<2a+2b-2
(C)a2+b2≤2a+2b-2 (D)a2+b2≥2a+2b-2