Question

\(3\frac{4}{5}+x=\frac{18}{5}\)

Answer 1

\(3\frac{4}{5}+x=\frac{18}{5}\)

Ta có : \(3\frac{4}{5}=\frac{5\times3+4}{5}=\frac{19}{5}\)

\(\frac{19}{5}+x=\frac{18}{5}\)

              \(x=\frac{18}{5}-\frac{19}{5}\)

              \(x=-\frac{1}{5}\)

Answer 2

\(3\frac{4}{5}+x=\frac{18}{5}\\ x=\frac{18}{5}-\frac{19}{5}\\ x=-\frac{1}{5}\)

Answer 3

\(3\frac{4}{5}+x=\frac{18}{5}\)

\(\frac{19}{5}+x=\frac{18}{5}\)

\(x=\frac{19}{5}-\frac{18}{5}\)

\(x=\frac{1}{5}\)

Answer 4

\(x=\frac{18}{5}-\frac{19}{5}\)

\(x=\frac{-1}{5}\)