F(x)-Φ(x)=Cx∈[a,b 令x=a→F(a)-Φ(a)=C d(a)=f(tn=0→F(a)=C op(x)=F(r-C f(tt= F(x)-F(a 令x=b→f(=F(b)-F(a)令x=aF(a)−(a)=C a f t dt a a ( ) = ( ) =0F(a)=C f (t)dt F(x) F(a) x a  = −  ∵(x)=F(x)−C 令x=b f (t)dt F(b) F(a) b a  = −  ∴F(x)−(x)=C x[a,b]