(2/2)差数列{a_n}中a_7=9,公差d=3,则a_11=?
(2/2)差数列{a_n}中a_7=9,公差d=3,则a_11=?
数学人气:866 ℃时间:2020-06-11 19:30:05
优质解答
a11=a7+3x4=9+12=21
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