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[单选题]
若∫f(x)dx=e-x2+c,则f(x)=()
A.-2xe-x2
B.-xe-x2
C.2xe-x2
D.xe-x2
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A.-2xe-x2
B.-xe-x2
C.2xe-x2
D.xe-x2
设f(x,y,z)在长方体V=[a,b]×[c,d]×[e,f]上可积,若对任何(y,z)∈D=[c,d]×[e,f]定积分F(y,z)=z)dx存在,证明F(y,z)在D上可积,且
若f(x)二阶可导且(x0,f(x0))是f(x)的拐点,则f(x0)=__________.
参考答案:错误