问题描述: 20的2n加3次方等于3000,求n的值 1个回答 分类: 数学 2014-10-05 问题解答: 我来补答 20^(2n+3) = 3000(2n+3)*lg20 = lg30002n+3 = lg3000/lg20 = (3 + lg3)/(1 + lg2) ≈ 2.6726所以,n = (2.6726 - 3)/2 ≈ -0.1637 展开全文阅读