a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a

来源:学生作业帮助网 编辑:六六作业网 时间:2024/05/15 10:06:36
a=-1求a-2a+3a-4a+5a-6a+...+99a-100aa=-1求a-2a+3a-4a+5a-6a+...+99a-100aa=-1求a-2a+3a-4a+5a-6a+...+99a-10

a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a

a=-1 求a-2a+3a-4a+5a-6a+...+99a-100a
a-2a+3a-4a+5a-6a+...+99a-100a
=a﹙1-2+3-4+···+99-100﹚
=-50a
=50

a-2a+3a-4a+5a-6a+...+99a-100a
=-50a
=50

50

50