Question

Помогите пожалуйста! Срочно

Answer 1

$- 2zb {z}^{2} + {b}^{2} 2zb = 2z {b}^{3} - 2b {z}^{3} = 2zb( {b}^{2} - {z}^{2} ) = 2zb(b - z)(b + z) \\ - - - - - - \\ 2zb(b - z)(b + z) = 2 \times \frac{1}{2} \times ( - 3)( - 3 - \frac{1}{2} )( - 3 + \frac{1}{2} ) = - 3 \times ( - 3 \frac{1}{2} )( - 2 \frac{1}{2} ) = - 3 \times ( - \frac{7}{2} ) \times ( - \frac{5}{2} ) = - \frac{3 \times 7 \times 5}{4} = - \frac{105}{4} = - 26 \frac{1}{4} = - 26.25$