问一道数学题~!!!
1+ -2+3+ -4+5+ -6+```````+99+ -100 问这100个数之和是多少??
可否把详细解题过程告诉我?SHANKES!!
参考答案:1+ -2+3+ -4+5+ -6+```````+99+ -100
=(1-2)+(3-4)+(5-6)+....+(99-100)
=(-1)*[(99-1)/2+1]
=(-1)*50
=-50
1+ -2+3+ -4+5+ -6+```````+99+ -100 问这100个数之和是多少??
可否把详细解题过程告诉我?SHANKES!!
参考答案:1+ -2+3+ -4+5+ -6+```````+99+ -100
=(1-2)+(3-4)+(5-6)+....+(99-100)
=(-1)*[(99-1)/2+1]
=(-1)*50
=-50