题目内容
阅读理解: 计算:(﹣5
)+(﹣9
)+17
+(﹣3
)
解析:因为
,
,
,
,
原式=[(﹣5)+(﹣
)]+[(﹣9)+(﹣
)]+(17+
)+[(﹣3)+(﹣
)]
=[(一5)+(﹣9)+17+(一3)]+[(﹣
)+(﹣
)+
+(﹣
)]
=0+(﹣1
)
=﹣1![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859069584.png)
上面这种计算方法叫折项法,你看懂了吗?
仿照上面的方法,请你计算:(﹣200
)+(﹣199
)﹣400
+(﹣1
)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094856453663.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094856575617.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094856677647.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094856784581.png)
解析:因为
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/201209220948568852528.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/201209220948569872500.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/201209220948570862011.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/201209220948571862379.png)
原式=[(﹣5)+(﹣
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094857295663.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094857394617.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094857738647.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094857836575.png)
=[(一5)+(﹣9)+17+(一3)]+[(﹣
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094857936658.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094858038613.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094858139638.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094858237575.png)
=0+(﹣1
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094858968584.png)
=﹣1
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859069584.png)
上面这种计算方法叫折项法,你看懂了吗?
仿照上面的方法,请你计算:(﹣200
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859168658.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859567613.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859670638.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859769575.png)
解:(﹣200
)+(﹣199
)﹣400
+(﹣1
)
=(﹣200﹣199﹣400﹣1)+(﹣
﹣
﹣
﹣
)
=﹣800﹣![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900684730.png)
=﹣802
.
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859868661.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094859972611.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900076644.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900174575.png)
=(﹣200﹣199﹣400﹣1)+(﹣
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900273658.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900373616.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900471640.png)
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900569575.png)
=﹣800﹣
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900684730.png)
=﹣802
![](http://thumb.1010pic.com/pic1/upload/papers/c02/20120922/20120922094900793640.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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