November 2019 1 121 Report
20 PONTOS. Me ajudem a encontrar o valo de a e b no sistema de equação exponencial.

 \left \{ {{4 ^{x} . 8 ^{y} = \frac{1}{4} } \atop {9 ^{x} . 27 ^{2y} = 3 }} \right.
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