Question

大一高数 高阶导数 这个题是C

Answer 1

f(x)=3x^3+x^2|x|

for x>0

f(x)=3x^3+x^3

f'(x) = 9x^2 +3x^2

f'(0+) = 0

f''(x) =18x+6x

f''(0+)=0

f'''(x) =18+6

f'''(0+) =24

for x