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@ -265,7 +265,7 @@ $$\lim\limits_{n \to \infty} [x_0]_n = x_0$$
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$$\lim\limits_{n \to \infty} x_n^{(3)} = x_0$$
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由于 $x_n^{(3)}$ 是有理数,所以 $D(x_n^{(3)}) = 1$,因此
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$$\lim\limits_{n \to \infty} D(x_n^{(1)}) = 1$$
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$$\lim\limits_{n \to \infty} D(x_n^{(3)}) = 1$$
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2. 构造第二个数列 $\{x_n^{(4)}\}$:
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