Toán Lớp 7: a) $2^{x}$ = 16
b)$\sqrt{81}$
c) $\sqrt{}$$\frac{3^2}{7^2}$
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Toán Lớp 7: a) $2^{x}$ = 16
b)$\sqrt{81}$
c) $\sqrt{}$$\frac{3^2}{7^2}$
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