Question

1, \(\dfrac{-3}{x-5}\)=\(\dfrac{2}{-5}\)

Giúp mk nhé

Answer 1

1, \(\dfrac{-3}{x-5}=\dfrac{2}{-5}\)

\(\Leftrightarrow\)-3.(-5) =(x-5) .2

\(\Leftrightarrow15=2x-10\)

\(\Leftrightarrow-2x=-10-15\)

\(\Leftrightarrow-2x=-25\)

\(\Leftrightarrow x=-25:\left(-2\right)\)

\(\Leftrightarrow x=\dfrac{-25}{-2}=\dfrac{25}{2}\)

Vậy \(x=\dfrac{25}{2}\)

Answer 2

Ta có : \(\dfrac{-3}{x-5}=\dfrac{2}{-5}\Rightarrow\left(x-5\right).2=\left(-3\right)\left(-5\right)\)

\(\Leftrightarrow2x-10=15\)

\(2x=25\Rightarrow x=\dfrac{25}{2}\)

Vậy \(x=\dfrac{25}{2}\) bạn nhé

tik mik nha !!

Answer 3

\(\dfrac{-3}{x-5}=\dfrac{2}{-5}\)

\(\Leftrightarrow\dfrac{-3}{x-5}=\dfrac{-2}{5}\)

\(\Leftrightarrow\left(x-5\right).\left(-2\right)=\left(-3\right).5\)

\(\Leftrightarrow\left(x-5\right).\left(-2\right)=-15\)

\(\Leftrightarrow x-5=\left(-15\right):\left(-2\right)\)

\(\Leftrightarrow x-5=7,5\)

\(\Leftrightarrow x=13,5\)

Vậy ...............