3 8（X-1）=27

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3 8（X-1）=27
3 8（X-1）=27

3 8（X-1）=27
(27/8)^(x-1)乘以(2/3)^(2x-3)=9/4
(3/2)^3(x-1)乘以(2/3)^(2x-3)=(3/2)^2
(3/2)^(3x-3)乘以(2/3)^(2x-3)=(3/2)^2
由(3/2)^(2x-3)乘以 (3/2)^x 乘以(2/3)^(2x-3)=(3/2)^2
得 (3/2乘以2/3)^(2x-3)乘以 (3/2)^x =(3/2)^2
1^(2x-3)乘以 (3/2)^x =(3/2)^2 又由 1^(2x-3)=1
得 (3/2)^x =(3/2)^2
所以x=2