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)
!!!!!!!!!!!!!!!!!!!!!!!!
2x²+3x-5=0
<span>(3x+y)(2x-5y)-6(x-y)=6x^2-13xy-y^2*5-6*(x-y)=6x^2-13xy-y^2*5-(6x-6y)=6x^2-13xy-5y^2-6x+6y</span>