Question

Решите
Срочно
Пожалуйста

Answer 1

Ответ:

1.

$( \frac{3}{2} x {y}^{3} + {x}^{2} ) - ( \frac{1}{2} x {y}^{3} - {x}^{2} ) - {y}^{4} = \\ \frac{3}{2} x {y}^{3} + {x}^{2} - \frac{1}{2} x {y}^{3} + {x}^{2} - {y}^{4} = \\ x {y}^{3} + 2 {x}^{2} - {y}^{4}$

При x = 4, y = - 1

$x {y}^{3} + 2 {x}^{2} - {y}^{4} = 4 \times {( - 1)}^{3} + 2 \times {4}^{2} - {( - 1)}^{4} = \\ 4 \times ( - 1) + 2 \times 16 - 1 = - 4 + 32 - 1 = 27$

2.

$- (xy - 3 {x}^{4} {y}^{4} ) - 3( {x}^{4} {y}^{4} - xy) = \\ - xy + 3 {x}^{4} {y}^{4} - 3 {x}^{4} {y}^{4} + 3xy = 2xy$

При x = 0,5, y = 10

$2xy = 2 \times 0.5 \times 10 = 10$