错误总结用到的表如下图：
[img]
[img]http://dl.iteye.com/upload/attachment/0080/9766/5763779c-b83b-3a0a-aea4-8d2900b409ad.png[/img]
[/img]
1，错误：sum后面加上了空格：
[img]
[img]http://dl.iteye.com/upload/attachment/0080/9773/9fae397e-576c-36fc-a41b-7b20741501ea.png[/img]
[/img]
[img]
[img]http://dl.iteye.com/upload/attachment/0080/9766/5763779c-b83b-3a0a-aea4-8d2900b409ad.png[/img]
[/img]
1，错误：sum后面加上了空格：
[img]
[img]http://dl.iteye.com/upload/attachment/0080/9773/9fae397e-576c-36fc-a41b-7b20741501ea.png[/img]
[/img]
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