Câu hỏi của Lê Ngân Khánh

Question

(x + 5)3 = $\dfrac{-64}{125}$

HT.Phong (9A5) · Accepted Answer

$\left(x+5\right)^3=\dfrac{-64}{125}$

$\Rightarrow\left(x+5\right)^3=\left(\dfrac{-4}{5}\right)^3$

$\Rightarrow x+5=-\dfrac{4}{5}$

$\Rightarrow x=-\dfrac{4}{5}-5$

$\Rightarrow x=-\dfrac{29}{5}$Câu trả lời: $\left(x+5\right)^3=\dfrac{-64}{125}$

$\Rightarrow\left(x+5\right)^3=\left(\dfrac{-4}{5}\right)^3$

$\Rightarrow x+5=-\dfrac{4}{5}$

$\Rightarrow x=-\dfrac{4}{5}-5$

$\Rightarrow x=-\dfrac{29}{5}$