3^(x+2) + 3^(x+1)< 28
3^x×3^2 + 3^x×3< 28
12×3^x<28
3^x<28/12
x<log3(28/12)
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3^(x+2) + 3^(x+1)< 28
3^x×3^2 + 3^x×3< 28
12×3^x<28
3^x<28/12
x<log3(28/12)
Ответ: x<log3(7/3)