1990+19901990+199019901990+…/1991+19911991+199119911991+…
=【1990×(1+10001+100010001+……)】/【1991×(1+10001+100010001)】
=1990/1991
计算:1990+19901990+199019901990+…/1991+19911991+199119911991+…
计算:1990+19901990+199019901990+…/1991+19911991+199119911991+…
数学人气:313 ℃时间:2020-03-26 08:27:34
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