有误！应该 if Not B then Not A sorry about that

win8888 · 2025-03-01 13:12:27Z

有误！应该 if Not B then Not A sorry about that简介

来源: win8888 于 2025-03-01 13:12:27 [档案] [旧帖] [给我悄悄话] 阅读数 : (0 bytes)

回答: if A then B。A是B的必要条件《=》If Not A then Not B。由 win8888 于 2025-03-01 13:10:10

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有误 ！应该 if Not B then Not A sorry about that