Question

Tìm x 

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

Answer 1

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

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

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

\(\left(\frac{1}{2}+\frac{3}{5}\right).x-\frac{6}{5}=3\)

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

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

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

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

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

Answer 2

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

<=>1/2.x+3/5.x-3/5.2=3

<=>(1/2+3/5).x=3+6/5

<=>11/10.x=21/5

<=>x=21/5:11/10

<=>x=42/11

Answer 3

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

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

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

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