令A=1×2+2×3+3×4+…+98×99+99×100且B=12+22+32 发布时间:2017-06-28 12:14 │ 来源:www.tikuol.com 题型:解答题 问题: 令A=1×2+2×3+3×4+…+98×99+99×100且B=12+22+32+…+982+992.那么A-B=______.
题型:解答题 We'll order tea for twelve people on the __that all twetve will come. [ ]A. moment B. situation C. surroundings D. assumption 查看答案