数列{an}是等差数列,若a11/a10

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数列{an}是等差数列,若a11/a10数列{an}是等差数列,若a11/a10数列{an}是等差数列,若a11/a10因为a11/a100时,则a11+a100S20=20(a1+a20)/2=10

数列{an}是等差数列,若a11/a10
数列{an}是等差数列,若a11/a10

数列{an}是等差数列,若a11/a10
因为a11/a100时,则a11+a100
S20=20(a1+a20)/2=10(a10+a11)