分からない問題はここに書いてね453

訂正します：

>>485

| f(x) | = | ∫_{0}^{x} (x - t) * f''(t) dt | ≦ ∫_{0}^{x} | (x - t) * f''(t) | dt

= ∫_{0}^{x} (x - t) * | f''(t) | dt ≦ ∫_{0}^{x} (x - t) * t dt

= (1/2)*x^3 - (1/3)*x^3 = (1/6) * x^3 = x^3 / 3!