f(u) = 根号(u+4)
f'(u) = 0.5x^(-1/2)
f''(u) = -0.25 x^(-3/2)
f'''(u) = 3/8 x^(-5/2)
f''''(u) = -15/16 x^(-7/2)
系数= -15/16 /(4!) = -5/128
对的啊?
f(u) = 根号(u+4)
f'(u) = 0.5x^(-1/2)
f''(u) = -0.25 x^(-3/2)
f'''(u) = 3/8 x^(-5/2)
f''''(u) = -15/16 x^(-7/2)
系数= -15/16 /(4!) = -5/128
对的啊?