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Toán Lớp 7: Tìm x biết : $\frac{1}{7}$ < | x-$\frac{4}{7}$ |< $\frac{3}{7}$

Home/ Toán Lớp 7: Tìm x biết : $\frac{1}{7}$ < | x-$\frac{4}{7}$ |< $\frac{3}{7}$

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