Question

determine o valor numérico das expressões algébricas

Answer 1

a) $x^{3} - \frac{2x}{3} - x^{4}$ = $( \frac{-1}{2})$³ - $\frac{2}{3} . (\frac{-1}{2}) - (\frac{-1}{2})$ = $\frac{-1}{8} + \frac{2}{6} + \frac{1}{2}$ = $\frac{-4 +6 +1}{2}$ = $\frac{3}{2}$

b) $-3 . ( \sqrt{16}) - \frac{5}{3} .( \sqrt{36}) = -3 (4) - \frac{5}{3} . (6) =-12 - \frac{30}{3} = -12 -10 =-22$

c) $\frac{1}{3} . (-1)^{2} - \frac{5}{2} . (-2) +1 = \frac{1}{3} + \frac{10}{5} + 1 = \frac{1}{3} + 2 + 1 = \frac{1}{3} + 3 = \frac{1+9}{3} = \frac{10}{3}$