计算:1-2+3-4+5-6+…+87-88=_.
问题描述:
计算:1-2+3-4+5-6+…+87-88=______.
答
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.