计算(+1)+(-2)+(+3)+(-4)+······+(-100)+(+101)+(-102)
问题描述:
计算(+1)+(-2)+(+3)+(-4)+······+(-100)+(+101)+(-102)
答
(+1)+(-2)+(+3)+(-4)+······+(-100)+(+101)+(-102)
=(1-2)+(3-4)+...+(101-102)
=(-1)+(-1)+...+(-1)
=(-1)*51
=-51