问题描述: 1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101 1个回答 分类:数学 2014-12-01 问题解答: 我来补答 1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101=1^2-2^2+3^2-4^2+5^2-6^2.-100^2+101^2=(1-2)(1+2)+(3-4)(3+4)+.(99-100)(99+100)+101^2=-(1+2+3+4.+99+100)+101^2=-101*50+101^2=101*(101-50)=5151 展开全文阅读