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daisukianata5112
2 năm trước
a) Cho A con C và B con D, chứng minh rằng (A hợp B) con (C hợp D) b) Chứng minh rằng: A\(B giao C)=(A\B) hợp (A\C) c) Chứng minh rằng: A\(B hợp C)=(A\B) giao (A\C) Các pác giúp iêm với hicc :<
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