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Ticket: 567571bcebc77 masrosid
19 Dec 22:03
Bagaimana membuktikan ini? jika a, b, c dan d bilangan real positif, buktikan (1-a)(1-b)(1-c)(1-d)>1- a - b - c-d Minta clue
Ticket: 4fdf4cb463eb0 uzumaki