【简答题】【消耗次数：1】
用于条件求和的函数是_____ 。
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相关题目
【多选题】
利用循环求1到5的和值，已知i=1，sum=0；利用循环每次让sum求和，然后i++；判断条件是i<6；则求和的循环操作是（）。
①
sum=sum+i
②
sum+=i
③
sum=i
④
i=sum+i
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more than to go
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the flowers were so beautiful
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aim
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did his parents make
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