5-2-1 若f(x)在[a,b]上可积,且f(x) 0,那么 _________
5-2-2 设f(x)、g(x)在[a,b]上均可积,当f(x) g(x)时,

5-2-3 f(x)在[a,b]上连续是f(x)在[a,b]上可积的_____条件.
5-2-4当f(x)为_________时,有 ；当f(x)为______时,有
5-2-5 设f(x)在[a,b]上连续,且 ,则在[a,b]上有f(x)_____ _