Algebra equation in C++

Question

I'm making a program where I used the equation:: (1/(1.0/×1)+(1.0/x2))
//the x are user input numbers
Anybody know how I can rearrange that equation with just one divide and one multiply??

Answer 1

This is simple math. Take the LCM of both of the denominators and then solve the equation.
e.g

2/4+3/8 = 4+3/8 = 7/8

Here LCM of 4 and 8 is 8.then I solve it using simple algebra.

Answer 2

1.0/x1 + 1.0/x2
=(1.0*x2+1.0*x1) / (x1*x2)
=(x2+x1) /(x1*x2)