Question

 Помогите √21*√3 6/7 +√(-2)⁶

Answer 1

$sqrt{21} * sqrt{3 frac{6}{7} } + sqrt{-2 ^{6} } = \ sqrt{21} * sqrt{ frac{27}{7} } + sqrt{64} = \ sqrt{81}+ sqrt{64} =9+8=17$