Hello anonymous!
a/b+b/a=5
a/b = x
x + 1/x = 5
x² + 1 = 5x
x² - 5x + 1 = 0
x1;2 = 2,5 +- √(2,5² -1)
x1 = 4,791287785
x2 = 0,208712153
a = 4,791287785 * b
a/b+b/a=5
4,791287785 * b / b + b / 4,791287785 * b = 5
4,791287785 + 1 / 4,791287785 = 5
5 = 5
Help ! Where is my mistake ?
Regards :- )