(-1)+(+2)+(-3)+(+4)+...+(-99)+(100)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/10 23:20:34
![(-1)+(+2)+(-3)+(+4)+...+(-99)+(100)](/uploads/image/z/10244947-67-7.jpg?t=%28-1%29%2B%28%2B2%29%2B%28-3%29%2B%28%2B4%29%2B...%2B%28-99%29%2B%28100%29)
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(-1)+(+2)+(-3)+(+4)+...+(-99)+(100)
(-1)+(+2)+(-3)+(+4)+...+(-99)+(100)
(-1)+(+2)+(-3)+(+4)+...+(-99)+(100)
(-1)+(+2)+(-3)+(+4)+...+(-99)+(100)
=[(-1)+(+2)]+[(-3)+(+4)]+...+[(-99)+(100)]
=1+1+……+1
=1×(100÷2)
=1×50
=50