※ 引述《king911015 (早已放弃爱上你)》之铭言： : x f(t) : Find a function f and a unmber a such that 6 + ∫ ----- dt =2√x for allx>0. : a t^2 x f(t) ( 6 + ∫ ----- dt )' = (2√x)' a t^2 f(x) 1 x^2 => ------ = ----- => f(x) = ------ x^2 √x √x ^^^^^^^^^^^^^^^^ x 1 ∫ ----- d* = 2√x - 6 => 2√a = 6 => √a = 3 => a = 9 a √* ^^^^^^^^ -- ▅▃_ ○ ◣" ◤ ~◤ ▊ ■υ◣... --

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