Решить уравнение, 2x*3^x+3^(x-2)=57

2x*3^x + 3^x/3^2 = 57
3^x*(2x + 1/9) = 57
Умножаем все на 9
3^x*(18x + 1) = 57*9 = 19*3*9 = 19*3^3 = 513
Очевидно, 18x + 1 = 19, то есть x = 1.
Но тогда 3^x = 3^1 = 3, и 3*19 = 57 ≠ 57*9
Видимо, в задании ошибка.
А решение этого уравнения - иррациональное число чуть больше 2.
y(2,2) = 3^(2,2)*(18*2,2 + 1) = 455,19 < 513
y(2,3) = 3^(2,3)*(18*2,3 + 1) = 530,572 > 513
Можно уточнить
y(2,27) = 3^(2,27)*(18*2,27 + 1) = 506,832 < 513
y(2,28) = 3^(2,28)*(18*2,28 + 1) = 514,635 > 513

√4.5 * √72 = √4.5 *√ 9*8 = √4.5 * 3 * √8 = √4.5 * 3 * √4*2 = √4.5 * 3 * 2 * √2 = √4.5 * 6 * √2 = √4.5*√2 * 6 = √9 * 6 = 3*6 = 18
т.к выглядит по татарски , напишу письменно
корень их 4,5 умножим на корень из 72 , разложим 72 на множители- 9 и 8( что бы корень исчез)  , корень из 9 - это 3 , следовательно получаем:
корень из √4.5 * 3 * √8 . 8 тоже можно разложить на множители - это 4*2
а корень из 4 - это 2,
получаем корень из 4,5, умноженное на 3, умноженное на на 2  и ещё раз умноженное на корень из двух
3 и 2 перемножаем , получаем 6.
и теперь у нас остаётся корень из 4,5 и корень из двух
их мы тоже перемножим , получим корень из 9
а корень из 9 - это 3
получается что 6*3=18
ОТВЕТ : 18
спрашивай, если что не понятно 

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But you never showed for me when I was ringing your cell phone

Oh, you don't know how it feels to be alone

Baby, oh, I'll make you know, I'll make you know, oh

I'm better off all by myself

Though I'm feeling kinda empty without somebody else

Oh, I hear you crying out for help

But you never showed for me when I was ringing your cell phone

Oh, you don't know how it feels to be alone

Baby, oh, I'll make you know, I'll make you know, oh

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