Đáp án: Giải thích các bước giải: $\dfrac{-2}{x}=\dfrac{-x}{\dfrac{8}{25}}$ $⇔\dfrac{2}{x}=\dfrac{x}{\dfrac{8}{25}}$ $⇔x.x=2.\dfrac{8}{25}$ $⇔x^2=\dfrac{16}{25}$ $⇔x=±\dfrac{4}{5}$ Bình luận
$\dfrac{-2}{x}=\dfrac{-x}{\dfrac{8}{25}}$ $→x^2=-2.(-\dfrac{8}{25})$ $→x^2=\dfrac{16}{25}$ \(→\left[ \begin{array}{l}x=\dfrac{4}{5}\\x=-\dfrac{4}{5}\end{array} \right.\) Bình luận
Đáp án:
Giải thích các bước giải:
$\dfrac{-2}{x}=\dfrac{-x}{\dfrac{8}{25}}$
$⇔\dfrac{2}{x}=\dfrac{x}{\dfrac{8}{25}}$
$⇔x.x=2.\dfrac{8}{25}$
$⇔x^2=\dfrac{16}{25}$
$⇔x=±\dfrac{4}{5}$
$\dfrac{-2}{x}=\dfrac{-x}{\dfrac{8}{25}}$
$→x^2=-2.(-\dfrac{8}{25})$
$→x^2=\dfrac{16}{25}$
\(→\left[ \begin{array}{l}x=\dfrac{4}{5}\\x=-\dfrac{4}{5}\end{array} \right.\)