Question

помогите плиз очень нужно

Answer 1

3^(2x-3) - 9^(x-1) + 27^(2x/3) = 675
3^(2x-3) - (3^2)^(x-1) + (3^3)^(2x/3) = 675
3^(2x-3) - 3^(2x-2) + 3^(2x) = 675
3^(2x-3)=t
t - 3t + 27t = 675
25t=675
t=27
3^(2x-3) = 27
3^(2x-3)=3^3
2x-3=3
2x=6
x=3