\(\dfrac{-2-0,2}{-0,25}=\dfrac{1}{-2x-0,2}\) (ĐK: \(x\ne-\dfrac{1}{10}\))
\(\Rightarrow\dfrac{-\left(2+0,2\right)}{-0,25}=\dfrac{1}{-\left(2x+0,2\right)}\)
\(\Rightarrow\dfrac{2+0,2}{0,25}=\dfrac{-1}{2x+0,2}\)
\(\Rightarrow\dfrac{2,2}{0,25}=\dfrac{-1}{2x+0,2}\)
\(\Rightarrow4\cdot2,2=\dfrac{-1}{2x+0,2}\)
\(\Rightarrow8,8=\dfrac{-1}{2x+0,2}\)
\(\Rightarrow2x+0,2=\dfrac{-1}{8,8}\)
\(\Rightarrow2x+0,2=-\dfrac{5}{44}\)
\(\Rightarrow2x=-\dfrac{5}{44}-0,2\)
\(\Rightarrow2x=-\dfrac{69}{220}\)
\(\Rightarrow x=-\dfrac{69}{220}:2\)
\(\Rightarrow x=-\dfrac{69}{440}\left(tm\right)\)
Vậy: \(x=-\dfrac{69}{440}\)
=>\(\dfrac{1}{-2x-0,2}=\dfrac{-2,2}{-0,25}=8,8\)
=>\(\dfrac{1}{2x+0,2}=8,8\)
=>2x+0,2=1/8,8
=>2x=1/8,8-0,2=-19/220
=>x=-19/440
\(\dfrac{-2-0,2}{-0,25}=\dfrac{1}{-2x-0,2}\) (ĐK: x ≠ -0,1)
\(\Rightarrow\dfrac{2+0,2}{0,25}=\dfrac{1}{-2x-0,2}\)
\(\Rightarrow\left(2+0,2\right)\left(-2x-0,2\right)=0,25\cdot1\)
\(\Rightarrow2,2\left(-2x-0,2\right)=0,25\)
\(\Rightarrow-4,4x-0,44=0,25\)
\(\Rightarrow-4,4x=0,25+0,44\)
\(\Rightarrow-4,4x=0,69\)
\(\Rightarrow x=\dfrac{0,69}{-4,4}=-\dfrac{69}{440}\)
#Urushi
