Question

5x elevado a 2 , menos, 4y elevado a 5; sendo que x= -2/5 e y= 1/2

Answer 1

$5x^2 - 4y^5 \\ \\ \\ Para: \\ \\ x = - \dfrac{2}{5} \\ y= \dfrac{1}{2} \\ \\ \\ 5.( - \dfrac{2}{5})^2 - 4. (\dfrac{1}{2})^5 \\ \\ \\ 5. \dfrac{4}{25} - 4. \dfrac{1}{32} \\ \\ \\ \dfrac{5.2}{25} - \dfrac{4.2}{32} \\ \\ \\ \dfrac{10}{25} - \dfrac{8}{32} \\ \\ \\ \dfrac{4}{5} - \dfrac{1}{8} \\ \\ \\ mmc ~de ~5, 8 = 40 \\ \\ \\ \dfrac{32 - 5}{40} \\ \\ \\ =\ \textgreater \ \dfrac{27}{40}$