Cho dãy tỉ số bằng nhau . Phát biểu nào sau đây là đúng? A.(dfrac{a}{b} = dfrac{c}{d} = dfrac{e}{f} = dfrac{{a + c – e}}{{b – d + f}}) B. (dfrac{a}{b} = dfrac{c}{d} = dfrac{e}{f} = dfrac{{a – c + e}}{{b + d – f}}) C. (dfrac{a}{b} = dfrac{c}{d} = dfrac{e}{f} = dfrac{{a – e}}{{b […]
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