已知50个数按规路排列:2,-4,6,-8,,98,-100,试求这50个数的和.
问题描述:
已知50个数按规路排列:2,-4,6,-8,,98,-100,试求这50个数的和.
答
=(2-4)+(6-8)+...+(98-100)
=25*(-2)
=-50