5天周四日期相加
2+(2+7)+(2+7+7)+(2+7+7+7)+(2+7+7+7+7)
=2x5+7x(1+2+3+4)
=80
5天周四日期相加
2+(2+7)+(2+7+7)+(2+7+7+7)+(2+7+7+7+7)
=2x5+7x(1+2+3+4)
=80
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