3 pangkat -2 + 4 pangkat 1 kurang 2 pangkat -3 Tolong dijelaskan ya Kak please Besok udah kumpul

[tex] {3}^{ - 2} + {4}^{1} - {2}^{ - 3} = \frac{1}{ {3}^{2} } + 4 - \frac{1}{ {2}^{3} } \\ = \frac{1}{9} + \frac{4}{1} - \frac{1}{8} \\ = \frac{8 + 288 - 9}{72} = \frac{287}{72} [/tex]