【多选题】【消耗次数：1】
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
参考答案：
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