6.f(x)= ,則f(x)在下列哪一區間為增函數? (A)(-1, 1) (B)(-∞, 1) (C)(0,∞) (D)(1,∞)
6.f(x)= ,則f(x)在下列哪一區間為增函數? (A)(-1, 1) (B..-阿摩線上測驗