(1+3+5.+99+101)-(2+4+6.+98+100) 这道题怎么算
1个回答

(1+3+5+······+99+101)—(2+4+6······+98+100)

=1+3+5+······+99+101-2-4-6-······-98-100

=(1-2)+(3-4)+(5-6)+……+(99-100)+101

=(-1)+(-1)+(-1)+……+(-1)+101           [共有50个(-1)相加]

=(-1)×50+101

=-50+101

=51