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$2 \sqrt{ 5 }$
Calculate the expression
$\sqrt{ \color{#FF6800}{ 5 } } \sqrt{ \color{#FF6800}{ 4 } }$
$ $ The multiplication and division of the square root of the same exponent is the same as the square root of the same operation $ $
$\sqrt{ \color{#FF6800}{ 5 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } }$
$\sqrt{ \color{#FF6800}{ 5 } \color{#FF6800}{ \times } \color{#FF6800}{ 4 } }$
$ $ Multiply $ 5 $ and $ 4$
$\sqrt{ \color{#FF6800}{ 20 } }$
$\sqrt{ \color{#FF6800}{ 20 } }$
$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $
$\color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 5 } }$
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