Mathematics, 25.07.2021 16:20 chrisholmes176

Trên N cho phép tính * xác định như sau: a* b= a,˅a, b ɛ N
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Trên N cho phép tính * xác định như sau: a* b= a,˅a, b ɛ N
xét các tính chất giao hoán, kết h...