(a²-9b²)(a²+9b²)(a^4+81b^4)*3^8*b^8=(a^4-81b^4)*(3b)^8=
=(a^8-(3b)^8)*(3b)^8=(3ab)^8-(3b)^16
Он не делится не как. Если 8*5= 40; 12*13= 156; 156+40=196; 196÷10=Не делится
Решение
<span>4(4x−23)^2−19(4x−23)+12=0
</span>4x - 23 = z
4z² - 19z + 12 = 0
D = 361 - 4*4*12 = 169
z₁ = (19 - 13)/8
z₁ = 0,75
z₂ = (19 + 13)/8
z₂ = 32/8
z₂ = 4
4x - 23 = 0,75
4x = 0,75 + 23
x₁ = 23,75/4
x₁ = 5,9375
4x - 23 = 4
4x = 4 + 23
4x = 27
x₂ = 6,75
Ответ: x₁ = 5,9375 ; x₂ = 6,75