(-1)+(+2)+(-3)+(+4)+.(-99)+(+100)怎么做?要脱视计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 05:12:24
![(-1)+(+2)+(-3)+(+4)+.(-99)+(+100)怎么做?要脱视计算](/uploads/image/z/3942495-63-5.jpg?t=%28-1%29%2B%28%2B2%29%2B%28-3%29%2B%28%2B4%29%2B.%28-99%29%2B%28%2B100%29%E6%80%8E%E4%B9%88%E5%81%9A%3F%E8%A6%81%E8%84%B1%E8%A7%86%E8%AE%A1%E7%AE%97)
(-1)+(+2)+(-3)+(+4)+.(-99)+(+100)怎么做?要脱视计算
(-1)+(+2)+(-3)+(+4)+.(-99)+(+100)怎么做?要脱视计算
(-1)+(+2)+(-3)+(+4)+.(-99)+(+100)怎么做?要脱视计算
(-1)+(+2)+(-3)+(+4)+.(-99)+(+100)
=(-1+2)+(-3+4)+...+(-99+100)
=1+1+...+1
=50
每两项结合
=1+1+1+……+1(共50个)
=50
(-1)+(+2)+(-3)+(+4)+......(-99)+(+100)
=2-1+4-3+6-5+...+100-99
=1+1+1+..+1
=1*50
=50