\[\boxed{\text{1237.\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\left( 2 - \sqrt{3} \right) \cdot \sqrt{7 + 4\sqrt{3}} =\]
\[= \left( 2 - \sqrt{3} \right) \cdot \sqrt{3 + 4\sqrt{3} + 4} =\]
\[= \left( 2 - \sqrt{3} \right) \cdot\]
\[\cdot \sqrt{\left( \sqrt{3} \right)^{2} + 2 \cdot 2 \cdot \sqrt{3} + 2^{2}} =\]
\[= \left( 2 - \sqrt{3} \right) \cdot \sqrt{\left( \sqrt{3} + 2 \right)^{2}} =\]
\[= \left( 2 - \sqrt{3} \right) \cdot \left| \sqrt{3} + 2 \right| =\]
\[= \left( 2 - \sqrt{3} \right)\left( 2 + \sqrt{3} \right) =\]
\[= 2^{2} - \left( \sqrt{3} \right)^{2} =\]
\[= 4 - 3 = 1\]