某项测试有
道必答题,甲和乙参加该测试,分别用数列
和
记录他们的成绩.若第
题甲答对,则
,若第
题甲答错,则
;若第
题乙答对,则
,若第
题乙答错,则
.已知
,且只有
题甲和乙均答错,则甲至少答对______________________ 道题.
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21-22高三上·河南·期中 查看更多[3]
河南省名校大联考2021-2022学年高三上学期期中考试文科数学试题河南省2021-2022学年高三上学期期中联考文科数学试题(已下线)考点25 数列求和及其运用-备战2022年高考数学典型试题解读与变式
更新时间:2021-11-21 06:32:16
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【推荐1】数列1,-2,2,-3,3,-3,4,-4,4,-4,5,-5,5,-5,5…的项正负交替,且项的绝对值为1的有1个,2的有2个,…,n的有n个,则该数列第30项是________ .
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【推荐2】已知递增数列
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满足:
(m为正整数),
.问:当
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【推荐2】记
项正项数列为
,
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,
,
,
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,
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