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Q1：1?110?1100?11000?…?11000000000
1-110-1100-11000-…-11000000000,=1-(0.1 0.01 0.001 …0.000000001),=1-0.111111111,=0.888888889.
Q2：{TITLE2}
{ANSWER2}
Q3：{TITLE3}
{ANSWER3}
Q4：{TITLE4}
{ANSWER4}
Q5：{TITLE5}
{ANSWER5}
Q6：{TITLE6}
{ANSWER6}
