计算: 1+(-2)+3+(-4)+5+(-6)+………………+99+(-100)=?

2024-11-25 09:35:27
推荐回答(1个)
回答1:

1-2+3-4+5-6+......+99-100
=(1-2)+(3-4)+……+(99-100)
=(-1)×(100÷2)
=-50