发布网友 发布时间:2024-10-24 06:31
共1个回答
热心网友 时间:2024-11-06 00:28
f(0)=f(c)-f'(c)*c+f''(m)*c^2/2
f(1)=f(c)+f'(c)*(1-c)+f''(n)*(1-c)^2/2
两式相减,得
f'(c)=f(1)-f(0)-f''(m)*c^2/2+f''(n)*(1-c)^2/2
所以
|f'(c)|<|f(1)|+|f(0)|+|f''(m)|*c^2/2+|f''(n)|*(1-c)^2/2
<a+a+b 2*(c^2+(1-c)^2) <2a+(b/2)