wolfiewolffromsketch
04.10.2021 •
Mathematics
Cho tập hợp X={-3;-2;0;1;2}. Trên X xác định quan hệ S như sau:
(a;b) ∈ ↔ a2- b2= a-b,∀a;b∈X
Chứng minh rằng S có tính chất đối xứng
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