'Distributive lawsand' presentation slideshows

????????????????1 5% ? ????????????????? 15% ? ??????????? 20% ???????????? 50% zhym@fudan

????????????????1 5% ? ????????????????? 15% ? ??????????? 20% ???????????? 50% zhym@fudan.edu.cn ?? 13212010027@fudan.edu.cn BBS id:abchjsabc ??? 1039 ?? 10302010007@fudan.edu.cn liy@fudan.edu.cn ??. A?B=A?C ? B=C cancellation law ? ? Example:A={1,2,3},B={3,4,5},C={4,5}, B ? C,

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