f(x)二阶可导,g(x) =∫(0,1)f(xt)dt,且lim x→0 f(x)/x =A问g'(x)在x=0处是否连续
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f(x)二阶可导,g(x)=∫(0,1)f(xt)dt,且limx→0f(x)/x=A问g''(x)在x=0处是否连续f(x)二阶可导,g(x)=∫(0,1)f(xt)dt,且limx→0f(x)/x=
f(x)二阶可导,g(x) =∫(0,1)f(xt)dt,且lim x→0 f(x)/x =A问g'(x)在x=0处是否连续
f(x)二阶可导,g(x) =∫(0,1)f(xt)dt,且lim x→0 f(x)/x =A问g'(x)在x=0处是否连续
f(x)二阶可导,g(x) =∫(0,1)f(xt)dt,且lim x→0 f(x)/x =A问g'(x)在x=0处是否连续
g(x) = ∫(0→1) ƒ(xt) dt
令u = xt,du = x dt
t = 0,u = 0
t = 1,u = x
g(x) = (1/x)∫(0→x) ƒ(u) du
g'(x) = (1/x) * ƒ(x) - (1/x²)∫(0→x) ƒ(u) du
g'(0) = lim(x→0) ƒ(x)/x - lim(x→0) [∫(0→x) ƒ(u) du]/x²
= A - lim(x→0) ƒ(x)/(2x)
= A - (1/2)A
= A/2
既然g'(0)存在,则g(x) = 0处连续,可导则必定连续.
max{f(x),g(x)}=1/2(f(x)+g(x)+|f(x)-g(x)|
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