f(x)=1/3ax^3+bx^2+cx(a
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f(x)=1/3ax^3+bx^2+cx(af(x)=1/3ax^3+bx^2+cx(af(x)=1/3ax^3+bx^2+cx(a1)f''(x)=ax^2+2bx+ca+2b+c=0c>0a+2b=
f(x)=1/3ax^3+bx^2+cx(a
f(x)=1/3ax^3+bx^2+cx(a
f(x)=1/3ax^3+bx^2+cx(a
1)
f'(x)=ax^2+2bx+c
a+2b+c=0
c>0
a+2b=-c(1)
或
a=-2b-c(2)
讨论
发现(1)可行
且a
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