379 Вычислить (379 – 382). 1) √21⋅6⋅7⋅8; 3) √225⋅0,16⋅400;

1) √21⋅6⋅7⋅8 = √3⋅7⋅6⋅7⋅8 = √3⋅6⋅7⋅7⋅8 = √3⋅3⋅2⋅7⋅7⋅4⋅2 = √3⋅3⋅2⋅2⋅7⋅7⋅4 = 3⋅2⋅7⋅2 = 6⋅14 = 84

3) √225⋅0,16⋅400 = √15⋅15⋅0,4⋅0,4⋅20⋅20= 15⋅0,4⋅20 = 15⋅8 = 120

Ответ: 1) 84; 3) 120