已知a+b+c=0且abc≠0,求1a2-b2-c2+1b2-a2-c2+1c2 发布时间:2017-05-23 21:58 │ 来源:www.tikuol.com 题型:解答题 问题: 已知a+b+c=0且abc≠0,求1a2-b2-c2+1b2-a2-c2+1c2-a2-b2的值.
题型:解答题 -Is Peter here?-Not yet, but he _____ be here soon. He is usually on time.[ ]A. wouldB. couldC. willD. may 查看答案