Question

determine o valor de cada espressao numérica a seguir
a) (-1/2)³+(-1/3)²
b)(-1/3)²-4.(-1/2)³​

Answer 1

Resposta:

$a) {( - \frac{ 1}{2} )}^{3} + { ( - \frac{1}{3}) }^{2} = - \frac{1}{8} + \frac{1}{9} = \frac{ - 9 + 8}{72} = - \frac{ 1}{72}$

$b) { ( - \frac{1}{3}) }^{2} - 4 \times ( - { \frac{1}{2}) }^{3} = \frac{1}{9} - 4 \times \frac{ - 1}{8} = \frac{1}{9} + \frac{4}{8} = \frac{8 + 36}{72} = \frac{44 \div 4}{72 \div 4} = \frac{11}{18}$