Question

1+(-2)+3+(4)+``````+99+(-100)怎么做,9月22日9点前一定要回答

Answer 1

1+(-2)+3+(-4)+``````+99+(-100) 题目这样的吧?

=(1-2)+(3-4)+...=（99-100）

=-1-1-.-1

=-1x50

=-50