B
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Cho $\dfrac{a}{b} = \dfrac{b}{c} = \dfrac{c}{d}$
Chứng minh : $(\dfrac{a + b + c}{b + c + d})^3 = \dfrac{a}{b}$
Chứng minh : $(\dfrac{a + b + c}{b + c + d})^3 = \dfrac{a}{b}$
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