[Toán 9] Hàm số

N

nguyenbahiep1

[laTEX]x = \frac{1}{t} \\ \\ f(x) + 3.f(\frac{1}{x}) = x^2 \\ \\ f(\frac{1}{t})+ 3.f(t) = \frac{1}{t^2} \\ \\ f(\frac{1}{x})+ 3.f(x) = \frac{1}{x^2} \\ \\ \Rightarrow f(x) = \frac{1}{8}.( \frac{3}{x^2}- x^2) \\ \\ f(2012) = \frac{1}{8}.( \frac{3}{2012^2}- 2012^2) [/laTEX]
 
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