1-(2-3)-(4-5)-(6-7)-……-(98-99)=

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/25 14:23:28
1-(2-3)-(4-5)-(6-7)-……-(98-99)=1-(2-3)-(4-5)-(6-7)-……-(98-99)=1-(2-3)-(4-5)-(6-7)-……-(98-99)=50—4950

1-(2-3)-(4-5)-(6-7)-……-(98-99)=
1-(2-3)-(4-5)-(6-7)-……-(98-99)=

1-(2-3)-(4-5)-(6-7)-……-(98-99)=
50

—4950

50

=1-2+3-4+5-6+7-.....-98+99
=1+1+1+.......+1
=1×50
=50

1+49*1=50

1

50

50,绝对正确,其实是50个1相加