设(5a 3b) 2 =(5a-3b) 2 A,则A=[ ]A 3ab B ab C 5ab D 2ab 设(5a 3b) 2 =(5a-3b) 2 A,则A=[ ]A 3ab B ab C 5ab D 2ab 发布时间:2025-07-02 00:19:52