S11
= (a1 + a11) × 11 ÷ 2
= 2a6 × 11 ÷ 2
= 11a6
= 11 × 100
= 1100
已知Sn为等差数列an的前n项和,a6=100,则S11=
已知Sn为等差数列an的前n项和,a6=100,则S11=
数学人气：963 ℃时间：2020-09-06 14:02:06
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