记△Sk=k-12k的长度,6=max{△sk} f(=)d=lim)f(c)△P △sk = z\k−1zk Ý, δ = max 16k6n {△sk}. XJ δ ªu"ž, XJØé C ©{9 ζk {X Û,Sn k4, o¡ù4ŠǑ¼ê f(z) ÷­ ‚ C È©, PŠ Z C f(z)dz = lim n→∞ X n k=1 f(ζk)△zk. 5/127