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Formula
Calculate the value
$\dfrac{ \left( \sqrt{ 7 } -2 \right) -2 }{ \left( \sqrt{ 7 } -2 \right) +2 }$
$\dfrac { 7 - 4 \sqrt{ 7 } } { 7 }$
Calculate the value
$\dfrac { \left ( \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \right ) \color{#FF6800}{ - } \color{#FF6800}{ 2 } } { \left ( \sqrt{ 7 } - 2 \right ) + 2 }$
 Get rid of unnecessary parentheses 
$\dfrac { \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } } { \left ( \sqrt{ 7 } - 2 \right ) + 2 }$
$\dfrac { \sqrt{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } } { \left ( \sqrt{ 7 } - 2 \right ) + 2 }$
 Find the sum of the negative numbers 
$\dfrac { \sqrt{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 4 } } { \left ( \sqrt{ 7 } - 2 \right ) + 2 }$
$\dfrac { \sqrt{ 7 } - 4 } { \left ( \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \right ) \color{#FF6800}{ + } \color{#FF6800}{ 2 } }$
 Get rid of unnecessary parentheses 
$\dfrac { \sqrt{ 7 } - 4 } { \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 2 } }$
$\dfrac { \sqrt{ 7 } - 4 } { \sqrt{ 7 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 2 } }$
 Remove the two numbers if the values are the same and the signs are different 
$\dfrac { \sqrt{ 7 } - 4 } { \sqrt{ 7 } }$
$\color{#FF6800}{ \dfrac { \sqrt{ 7 } - 4 } { \sqrt{ 7 } } }$
 Calculate the expression 
$\color{#FF6800}{ \dfrac { \left ( \sqrt{ 7 } \right ) ^ { 2 } - 4 \sqrt{ 7 } } { 7 } }$
$\dfrac { \left ( \sqrt{ \color{#FF6800}{ 7 } } \right ) ^ { \color{#FF6800}{ 2 } } - 4 \sqrt{ 7 } } { 7 }$
 If you square the radical sign, it will disappear 
$\dfrac { \color{#FF6800}{ 7 } - 4 \sqrt{ 7 } } { 7 }$
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