Question

матан..........................

Answer 1

3^(5x+1)+3^(5x-1)=30
(3^5x)*3^1+(3^5x)*(3⁻¹)=30
3*(3^5x)+(1/3)*(3^5x)=30
(3^5x)*(3+1/3)=30
(3^5x)*(10/3)=30
3^5x=9
3^5x=3²
5x=2
x=0,4
x/(x+1), 0,4/(0,4+1)=0,4/1,4=0,2/0,7=2/7