Question 871635
{{{(1/a + 1/b) / (a/b - b/a)=((ab)(1/a + 1/b)) /((ab) (a/b - b/a))}}}
{{{(1/a + 1/b) / (a/b - b/a)=(b+a) / (a^2 - b^2)}}}
{{{(1/a + 1/b) / (a/b - b/a)=(b+a) / ((a-b)(a+b))}}}
{{{(1/a + 1/b) / (a/b - b/a)=highlight(1 / (a - b))}}}