1-2+3-4+5-6+...+99-100

2025-02-23 13:11:08
推荐回答(5个)
回答1:

解:原式=(1-2)+(3-4)+...+(99-100)
=(-1)×50
=-50

回答2:

1-2+3-4+5-6+....+99-100

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

=-50

望采纳!

回答3:

1-2+3-4+5-6+...+99-100
=(1-2)+(3-4)+(5-6)+...+(99-100)
=(-1)+(-1)+(-1)+。。。。。。+(-1)
=(-1)*100/2
=-50

回答4:

1-2+3-4+5-6+...+99-100
=(1-2)+(3-4)+(5-6)+...+(99-100)
=(-1)+(-1)+(-1)+............+(-1)
=(-1)*100/2
=-50

回答5:

(1-2)=-1 (1-2)+(3-4)+...+(99-100)=50x(-1)=-50