Question

номер 3 пожалуйста.

Answer 1

А) $-15x^6y^4$

Б) $16x^4y^{16}$

Answer 2

$5 {x}^{4} y*( - 3x {}^{2} {y}^{3} ) = - 15x {}^{6} {y}^{4} \ \ ( - 2x y{}^{4} ) {}^{4} = ( - 2) {}^{4} * {x}^{4} *( {y}^{4} ) {}^{4} = 16x {}^{4} {y}^{16}$