(1+3+5+...+99+101)-(2+4+6+8+...+98+100)=?
问题描述:
(1+3+5+...+99+101)-(2+4+6+8+...+98+100)=?
答
(1+3+5+...+99+101)-(2+4+6+8+...+98+100)
=(1-2)+(3-4)+...+(99-100)+101
=(-1)x50+101
=101-50
=51