计算:1-2+3-4+5-6+…+87-88=_.

问题描述:

计算:1-2+3-4+5-6+…+87-88=______.

1-2+3-4+5-6+…+87-88
=(1-2)+(3-4)+(5-6)+…+(87-88)
=-1×

88
2

=-1×44
=-44.
故应填-44.