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