Question

ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО ​

Answer 1

$-21\sqrt{3} +\sqrt{27} =-21\sqrt{3} +\sqrt{9\cdot 3} =-21\sqrt{3} +3\sqrt{3} =\boxed{-18\sqrt{3}}\\\\\\\sqrt{24}+8\sqrt{6}=\sqrt{4\cdot 6} +8\sqrt{6}=2\sqrt{6}+8\sqrt{6}=10\sqrt{6}\\\\\\\sqrt{99}-\sqrt{176}=\sqrt{9\cdot 11}-\sqrt{16\cdot 11}=3\sqrt{11}-4\sqrt{11} =\boxed{-\sqrt{11}}\\\\\\5\sqrt{92} -\sqrt{2300}=5\sqrt{4\cdot23}-\sqrt{100\cdot23}=5\cdot2\sqrt{23}-10\sqrt{23}=10\sqrt{23}-10\sqrt{23}=\boxed0$