Question

1. Tìm x biết :

1/2. x + 3/5. ( x - 2 ) =3

Answer 1

\(\frac{1}{2}\times x+\frac{3}{5}\times\left(x-2\right)=3\)

\(\frac{1}{2}\times x+\frac{3}{5}\times x-\frac{6}{5}=3\)

\(\frac{11}{10}x=3+\frac{6}{5}\)

\(\frac{11}{10}x=\frac{21}{5}\)

\(x=\frac{21}{5}\div\frac{11}{10}\)

\(x=\frac{21}{5}\times\frac{10}{11}\)

\(x=\frac{42}{11}\)