Решение
1) 2^(5x - 4) = 2^(4x + 12)
5x - 4 = 4x + 12
x = 16
2) 3^x = t, t > 0
t² - 2t - 3 = 0
t₁ = 3
t₂ = - 1 не удовлетворяет условию: t > 0
3^x = 3
x = 1
3) 3*3^2x - 3^2x - 53*3^x - 27 = 0
2*(3^2x) + 53*(3^x) - 27 = 0
3^x = z, z > 0
2z² - 53z - 27 = 0
D = 2809 + 4*2*27 = 3025
z₁ = ( 53 + 55)/4
z₁ = 108 /4
z₁ = 27
z₂ = ( 53 - 55)/4
z₂ = - 1/2 не удовлетворяет условию: z > 0
3^x = 27
3^x = 3³
x = 3
<span>(10x^2+1/3a^2)^3
1000x^6+3*100x^4*1/3a^2+3*10x^2*1/9a^4+1/27a^6
1000x^6+100a^2x^4+3 1/3a^4x^2+1/27a^6
Решал способом : (a+b)^3 = a^3 + 3a^2b + 3ab^2 + b^3</span>
2a^2 - 3a + 1 - 7a^2 + 5a = - 5a^2 + 2a + 1