摘要： $\bf命题：$设$f\left( x \right) \in {C^2}\left[ {0,1} \right]$，且$f\left( 0 \right) = f\left( 1 \right) = 0$，则$${\rm{ }}\int_0^1 {\left| {f''\left( x \righ... 阅读全文

摘要： $\bf命题：$$(\bf{似序不等式})$设$f\left( x \right),g\left( x \right)$均在$\left[ {a,b} \right]$上连续且函数的单调性相同，则\[\left( {b - a} \right)\int_a^b {f\left( x \right)g... 阅读全文