1个回答
2013-08-09
展开全部
因为{an}为等比数列
所以a1*a10=a2*a9=a3*a8=a4*a7=a5*a6=9
log3a1+log3a2+……+log3a10
=log3a1+log3a10+log3a2+log3a9+...log3a5+log3a6
=log3(a1*a10)+log3(a2*a9)+...log3(a5*a6)
=2+2+2+2+2
=10
所以a1*a10=a2*a9=a3*a8=a4*a7=a5*a6=9
log3a1+log3a2+……+log3a10
=log3a1+log3a10+log3a2+log3a9+...log3a5+log3a6
=log3(a1*a10)+log3(a2*a9)+...log3(a5*a6)
=2+2+2+2+2
=10
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