20的2n加3次方等于3000,求n的值
问题描述：
20的2n加3次方等于3000,求n的值
答
20^(2n+3) = 3000
(2n+3)*lg20 = lg3000
2n+3 = lg3000/lg20 = (3 + lg3)/(1 + lg2) ≈ 2.6726
所以,n = (2.6726 - 3)/2 ≈ -0.1637