摘要: (a + b)2 = a2 + 2ab + b2 (a + b)3 = a3 + 3a2b + 3ab2 + b3 (a + b)4 = a4 + 4a3b + 6a2b2 + 6ab3 + b4 (a + b)5 = a5 + 5a4b + 10a3b2 + 10a2b3 + 5ab4 + b5 阅读全文
posted @ 2018-03-10 14:00 Roni_i 阅读(1199) 评论(0) 推荐(0) 编辑