What is the value ?✍️✍️✍️✍️ MathThreads @mathtel1

2025-01-19 10:58

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2 小時內	Hsuan-Hung William Kuo hsuanhungwilliam	f(2)=26 f(5)=-12 f(100)=28 f(500)=16#
17 小時內	Toru Shikembaru torushikembaru0417	from f(10)=14, f(20)=40, f(xy) = f(x) + f(y). f(20) = f(2)+f(10) =f(2)+14=40. then f(2)=40-14=26 f(10) = f(2)+f(5) = 26+f(5) = 14 then f(5) = 14-26 = -12 therefore f(500) = f(5) + f(100) = f(5) + f(10) + f(10) = f(5) + 2f(10) = -12+2×14 = -12+28 = 16