f(x)=1/3*x^3+1/2ax^2+bx+1 (a,b∈R,b>=-2)当x∈[-根号2,根号2]时总有f'(x)

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f(x)=1/3*x^3+1/2ax^2+bx+1(a,b∈R,b>=-2)当x∈[-根号2,根号2]时总有f''(x)f(x)=1/3*x^3+1/2ax^2+bx+1(a,b∈R,b>=-2)当x∈

f(x)=1/3*x^3+1/2ax^2+bx+1 (a,b∈R,b>=-2)当x∈[-根号2,根号2]时总有f'(x)
f(x)=1/3*x^3+1/2ax^2+bx+1 (a,b∈R,b>=-2)当x∈[-根号2,根号2]时总有f'(x)

f(x)=1/3*x^3+1/2ax^2+bx+1 (a,b∈R,b>=-2)当x∈[-根号2,根号2]时总有f'(x)
f'(x)=x²+ax+b=(x+a/2)²-a²/4+b