$$frac{{{{left( {4.53 - 3.07} right)}^2}}}{{left( {3.07 - 2.15} right)left( {2.15 - 4.53} right)}} + , $$ $$frac{{{{left( {3.07 - 2.15} right)}^2}}}{{left( {2.15 - 4.53} right)left( {4.53 - 3.07} right)}} + ,, $$ $$frac{{{{left( {2.15 - 4.53} right)}^2}}}{{left( {4.53 - 3.07} right)left( {3.07 - 2.15} right)}}$$ is simplified to :