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1 . 有些银行存款按照复利的方式计算利息,即把前一期的利息与本金加在一起作为本金,再计算下一期利息.假设最开始本金为
元.每期利率为
时,在
期后本息和为
.若
,则
.解得
.银行业中经常使用的“70”原则:因为
,而且当
比较小时,
,所以
.若
,
.则
的最小整数值为( )
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2020-11-04更新
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4卷引用:辽宁省辽南协作体2019-2020学年高三上学期期末考试数学文试题