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例子
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设s(x)=x*x^(1/x),r(x)=圆(s(x;
a(1)=2:
s(2)=2.8284271。。。,
d(2)=0.17157。。。;
a(2)=5:
s(5)=6.8986483。。。,
d(5)=0.10135169。。。;
a(3)=6:
s(6)=8.0880369。。。,
d(6)=0.08803692。。。;
a(4)=15:
s(15)=17.96790087。。。,
d(18)=0.03209912。。。;
a(5)=16:
s(16)=19.02731384。。。,
d(19)=0.02731384。。。;
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