Помогите 1/2 * √7 * 1/7 *3√28

Question

Помогите
1/2 * √7 * 1/7 *3√28

Answer 1

= ( ( 1/2 ) * ( 1/7 ) * ( ( √ 7 ) * ( 3 √ 28 )) = ( 1/14 ) * ( 3 √ 196 ) = ( 3/14 ) * 14 = 3