jawab nya pake caranya ya :)

[tex] {3 }^{ - 2} + {4}^{ - 1} - {2}^{ - 3} \\ \frac{1}{9} + \frac{1}{4} - \frac{1}{8} \\ \frac{1 \times 8}{9 \times 8} + \frac{1 \times 18}{4 \times 18} - \frac{1 \times 9}{9 \times 8} \\ \frac{8}{72} + \frac{18}{72} - \frac{9}{72} \\ \frac{17}{72} [/tex]