[tex] \frac{ {3}^{a + 1} - {3}^{a + 2} + {3}^{a + 3} }{ {3}^{a + 1} + {3}^{a + 2} } \\ \frac{ {3}^{a}( {3}^{1} - {3}^{2} + {3}^{3} )}{ {3}^{a} ( {3}^{1} + {3}^{2}) } \\ \frac{3 - 9 + 27 }{3 + 9} \\ \frac{21}{12} \\ \frac{7}{4} [/tex]
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RESOLUCIÓN:
[tex] \frac{ {3}^{a + 1} - {3}^{a + 2} + {3}^{a + 3} }{ {3}^{a + 1} + {3}^{a + 2} } \\ \frac{ {3}^{a}( {3}^{1} - {3}^{2} + {3}^{3} )}{ {3}^{a} ( {3}^{1} + {3}^{2}) } \\ \frac{3 - 9 + 27 }{3 + 9} \\ \frac{21}{12} \\ \frac{7}{4} [/tex]
RESPUESTA:
[tex]c) \: 7/4[/tex]