有这样一道数列综合题,它可以利用等差、等比数列的性质、公式来解决.但由于结论是求一个比值,于是联系到比例的性质,发现灵活运用比例性质来解决更加巧妙、简单,更加具有规律性,达到事半功倍的效果. There is such a series of comprehensive questions, which can be solved by using the characteristics of equal-difference, equal-magnitude sequence, and formulas. But because the conclusion is to find a ratio, it is linked to the nature of proportions, and it is found that the flexible use of proportionality is more clever and simple. More regularity, to achieve a multiplier effect.