tentukan nilai a jika : a.(1/3)a = 1/3 b.(1/4)a = 1/64 c.2a =128 d.a²= 49 e.(2/9a =4/81 Jawab

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[tex]a) \: \frac{1}{3} a = \frac{1}{3} \\ 3a = 3 \\ a = 1 \\ \\ b) \: \: \frac{1}{4} a = \frac{1}{64} \\ 64a = 4 \\ a = \frac{4}{64} \\ = \frac{1}{16} \\ \\ c) \: \: 2a = 128 \\ a = \frac{128}{2} \\ a = 64 \\ \\ d) \: {a}^{2} = 49 \\ {a}^{2} - 49 = 0 \\ (a - 7)(a + 7) = 0 \\ a = 7 \: atau \: a = - 7 \\ e )\: \frac{2}{9} a = \frac{4}{81} \\ 2 \times 81a = 9 \times 4 \\ a = \frac{36}{162} \\ a = \frac{2}{9} [/tex]