搜搜考试网离散数学问题，英文的Determine whether each of these sets is countable
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离散数学问题，英文的
Determine whether each of these sets is countable or uncountable. For those that are countably infinite, exhibit a one-to-one correspondence between the set of positive integers and that set.
a)the real numbers with decimal representations consisting of all 1s
b)the real numbers with decimal representations of all 1s or 9s
能把a) b)内容翻译出来吗？看不懂啊。
Determine whether each of these sets is countable or uncountable. For those that are countably infinite, exhibit a one-to-one correspondence between the set of positive integers and that set.
a)the real numbers with decimal representations consisting of all 1s
b)the real numbers with decimal representations of all 1s or 9s
能把a) b)内容翻译出来吗？看不懂啊。
a)
用实数的小数表示法，各位数字全部由数字1构成的实数。
b)
用实数的小数表示法，各位数字全部由数字1或者数字9构成的实数。
用实数的小数表示法，各位数字全部由数字1构成的实数。
b)
用实数的小数表示法，各位数字全部由数字1或者数字9构成的实数。
离散数学问题，英文的Determine whether each of these sets is countable
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