已知:(27/8)^(x-1) * (2/3)^(2x-3) = 4/9 ,则x=____

问题描述:

已知:(27/8)^(x-1) * (2/3)^(2x-3) = 4/9 ,则x=____

已知:(27/8)^(x-1) * (2/3)^(2x-3) = 4/9 ,则x=-2

(27/8)^(x-1) × (2/3)^(2x-3)
=(3/2)^(3X-3)×(2/3)^(2X-3)
=(2/3)^〔-(3X-3)〕×(2/3)^(2X-3)
=(2/3)^(-X)
4/9=(2/3)^2
所以-X=2,X=-2