Question

1/1/R1+1/R2, how is that equivalent to R1/R1+R2/R2

Answer 1

This is very confusing how you've typed this here. It is impossible to tell exactly what fraction has what numbers in it and are you adding the 1/R2 to the whole first fraction or just the denominator of the first fraction? Is there a way you can type this in, or even draw it with the drawing tool, to make it a bit more clear?