15ху - 5x + 18y - 6, если х = -0,9, y = $$1\frac{1}{3}$$.
y = $$ \frac{4}{3} $$
15 * (-0.9) * $$ \frac{4}{3} $$ - 5 * (-0.9) + 18 * $$ \frac{4}{3} $$ - 6 = -$$ \frac{15 * 0.9 * 4}{3} $$ + 4.5 + $$ \frac{18 * 4}{3} $$ - 6 = -$$ \frac{54}{3} $$ + 4.5 + $$ \frac{72}{3} $$ - 6 = -18 + 4.5 + 24 - 6 = 4.5
Ответ: 4,5