Question

(-1)+2+(-3)+4+……+(-99)+100=?

过程谢谢

Answer 1

(-1)+2+(-3)+4+……+(-99)+100=(-1+2)+(-3+4)+(-5+6)+......+(-99+100)=1+1+1+......+1[这里一共50组，所以是50个1]=50

Answer 2

(-1)+2+(-3)+4+……+(-99)+100
=1+1+。。。+1 （每两项合起来是1，共50个1）
=50

Answer 3

(-1)+2+(-3)+4+……+(-99)+100=50*1=50

Answer 4

每两项相加都得1一共有50项所以就得50.
2-1+4-3+6-5……+100-99=50

Answer 5

1乘以（100/2）=50

Answer 6

50