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giang7annn


bài 1 : Tìm giá trị sao cho
a; $3^x$ < $\frac{1}{9}$
b; $4^{2x-1}$ $\geq$ 64
c; $9^{x-2}$ \leq 81
a; $3^x$ < $\frac{1}{9}$
b; $4^{2x-1}$ $\geq$ 64
c; $9^{x-2}$ \leq 81
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