Question 631296
{{{ 1/2 + ( (2/3) / (3/4) ) - ( 4/5 * 5/6 ) }}}
Take the last term first
{{{ 4/5 * 5/6 = (5/5) * (4/6) }}}
{{{ (5/5) * (4/6) = 4/6 }}}
So far I have
{{{ 1/2 + ( (2/3) / (3/4) ) - 4/6 }}}
and
{{{ 3/6 + ( (2/3) / (3/4) ) - 4/6 }}}
{{{ ( (2/3) / (3/4) ) - 1/6 }}} 
Multiply the top and bottom of the
first term by {{{ 4/3 }}}
{{{ ( (2/3)*(4/3) ) / ( (3/4)*(4/3) ) }}}
{{{ ( (3/3)*(2/4) ) / ( (3/3)*(4/4) ) }}}
{{{ (2/4) / 1 }}}
{{{ 2/4 = 1/2 }}}
So I have
{{{ 1/2 - 1/6 }}}
{{{ 3/6 - 1/6 = 2/6 }}}
{{{ 2/6 = 1/3 }}} answer