Question

Найдите значение выражения.

Answer 1

${y}^{2} - 9y + 8 = {( \frac{1}{2}) }^{2} - 9 \times \frac{1}{2} + 8 = \frac{1}{4} - \frac{9}{2} + 8 = \frac{1}{4} - \frac{18}{4} + \frac{32}{4} = \frac{15}{4} = 3 \frac{3}{4}$