【多选题】【消耗次数：1】
总效用和边际效用的关系
①
A、当边际效用为零时，总效用最大
②
B、当边际效用为零时，总效用最小
③
C、当边际效用为负时，总效用递减
④
D、当边际效用为负时，总效用递增
⑤
E、.当边际效用为正时，总效用递增
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相关题目
【多选题】
总效用和边际效用的关系是（ ）。
①
当边际效用为0时，总效用最大
②
当边际效用为负时，总效用递减
③
当边际效用为正时，总效用递增
④
当边际效用为0时，总效用递增
⑤
当边际效用为负时，总效用不变
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