Question

1/4 (5x - 16) - 1/2 (3rd - 8) при x=2 2/5 , y = 6

Answer 1

$\frac{1}{4} (5x - 16) - \frac{1}{2} (3y - 8) = \\ \frac{5}{4} x - 4 - \frac{3}{2} y + 4 = \\ \frac{5}{4}x - \frac{3}{2} y = \frac{5}{4} \times 2 \frac{2}{5} - \frac{3}{2} \times 6 = \\ \frac{5}{4} \times \frac{12}{5} - \frac{3}{2} \times \frac{6}{1} = \\ 3 - 9 = - 6$