5. 下列各函數，何者為增函數？
(A)\(f(x) = -x^2, x \le 0\)
(B)\(f(x) = \sin x, \frac{\pi}{2} \le x \le \frac{3\pi}{2}\)
(C)\(f(x) = \ln x - x, x \ge 1\)
(D)\(f(x) = \frac{1}{x}\)

阿摩線上測驗 · 2026-09-02T15:00:12+08:00

5. 下列各函數，何者為增函數？ (A)f(x) = -x^2, x 0(B)f(x) = x, π/2 x 3π/2 (C)f(x) = x - x, x 1 (D)f(x) = 1/x

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5. 下列各函數，何者為增函數？(A)\(f(x) = -x^2, x \le 0\)(B)\(f(x) = \sin x, \frac{\pi}{2} \le x \le \frac{3\pi}{2}\)(C)\(f(x) = \ln x - x, x \ge 1\)(D)\(f(x) = \frac{1}{x}\)