-Х(9х+12)-4=0
Х=0
9х+12-4=0
9х=4-12
9х=-3
Х=-3/9
Х=-1/3
(1.3 * 3.8 ) / 1.9
(1.3 * 3.8 ) = 4,94
(1.3 * 3.8 ) / 1.9 =4,94 / 1,9 = 2,6
Ответ: 2,6
у=3^(х+1)-2,
3^(x+1)=y+2,
3^(x+1)=3^log_3(y+2),
x+1=log_3(y+2),
x=log_3(y+2)-1,
y+2>0,
y>-2,
Ey=(-2;+00)
у=5^(-2х-1)+4,
5^(-2х-1)=y-4,
5^(-2х-1)=5^log_5(y-4),
-2x-1=log_5(y-4),
-2x=log_5(y-4)+1,
x=-1/2log_5(y-4)-1/2,
y-4>0,
y>4,
Ey=(4;+00)