Question

0,45x+1/5=19/4

Tìm x

mn giúp em với ạ:3

Answer 1

\(0,45x+\dfrac{1}{5}=\dfrac{19}{4}\)

\(0,45x=\dfrac{19}{4}-\dfrac{1}{5}\) 

\(0,45x=\dfrac{91}{20}\)

\(x=\dfrac{91}{20}:0,45\)

\(x=\dfrac{91}{9}.\)

Answer 2

\(0,45x+\dfrac{1}{5}=\dfrac{19}{4}\)

\(\dfrac{9}{20}x+\dfrac{1}{5}=\dfrac{19}{4}\)

\(\dfrac{9}{20}x=\dfrac{19}{4}-\dfrac{1}{5}\)

\(\dfrac{9}{20}x=\dfrac{95}{20}-\dfrac{4}{20}\)

\(\dfrac{9}{20}x=\dfrac{91}{20}\)

     \(x=\dfrac{91}{20}:\dfrac{9}{20}\)

     \(x=\dfrac{91}{20}\cdot\dfrac{20}{9}\)

     \(x=\dfrac{91}{9}\)