3-²+2-³ adalah.. A.20/72 B.17/72 C.9/72 D.8/72

[tex] \frac{1}{ {3}^{2}} + \frac{1}{ {2}^{3} } = \frac{1}{9} + \frac{1}{8} = \frac{8 + 9}{72} = \frac{17}{72} [/tex]
jawabannya b

= 1/3² + 1/2³
= 1/9 + 1/8
= 8/72 + 9/72
= 17/72              (B)