Explicație pas cu pas:
[tex]38 - (12.8^{2} \div 32 + 3 \times (14.4 \div 12 + 0.76)) = \\ 38 - (( \frac{64}{5} ) ^{2} \div \frac{1}{32} + 3 \times (1.2 + 0.76)) = \\ 38 - ( \frac{4096}{25} \div \frac{1}{32} + 3 \times 1.96)= \\ 38 - ( \frac{128}{25} + 5.88) = \\ 38 - ( \frac{128}{25} + \frac{147}{25} ) = \\ 38 - 11 = 27 \: \: \: \: \\ = > n \: este \: un \: nr \: natural \: cub \: perfect[/tex]
