45. 試問 ∫₀^∞ (x / (1+x⁴)) dx 為何?
(A) π/8
(B) π/4
(C) π/2
(D) 1
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統計: A(1), B(0), C(0), D(0), E(0) #3917488
統計: A(1), B(0), C(0), D(0), E(0) #3917488