※ 引述《llccyy (狗狗)》之銘言:
: x s
: Let G(x)=∫[s∫f(t)dt]ds,where f is continuous for all real t.
: 0 0
: Find(a)G(0) (b)G'(0) (c)G"(x) (d)G"(0)
(a)G(0)=0
x
(b)G'(x)=x∫f(t)dt ∴G'(0)=0
0
x
(c)G"(x)=∫f(t)dt + xf(x)
0
(d)G"(0)=0*f(0)=0
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