Question

Помогите пожалуйста!!!!!!!

Answer 1

а)=
$sqrt{(61 - 60) times (61 + 60)}$
=
$sqrt{1 times 121}$
= 11
б) =
$sqrt{(8.5 - 8.4) times (8.5 + 8.4)}$
=
$sqrt{1.69}$
=1.3