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Toán Lớp 9: Từ $\dfrac{a}{b}$ . CM rằng : $\dfrac{5a + 5b}{5a – 5b}$ = $\dfrac{7a + 7b}{7a – 7b}$

Home/ Toán Lớp 9: Từ $\dfrac{a}{b}$ . CM rằng : $\dfrac{5a + 5b}{5a – 5b}$ = $\dfrac{7a + 7b}{7a – 7b}$

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