const (
    MININT64 = -922337203685477580
    MAXINT64 = 9223372036854775807
)
 
 
func Max(nums... int64) int64 {
    var maxNum int64 = MININT64
    for _, num := range nums {
        if num > maxNum {
            maxNum = num
        }
    }
    return maxNum
}
 
 
 
 
func Min(nums... int64) int64 {
    var minNum int64 = MAXINT64
    for _, num := range nums {
        if num < minNum {
            minNum = num
        }
    }
    return minNum 
}
 
 
 
func Sum(nums... int64) int64 {
    var sumNum int64 = 0
    for _, num := range nums {
            sumNum += num
    }
    return sumNum 
}

以上是对整形的实现,浮点型需要使用math.Max包下的函数更为科学严谨。