\(3x\left(x-\frac{2}{5}\right)=0\)
\(\Rightarrow3x=0\) Hoặc \(\Rightarrow x-\frac{2}{5}=0\)
Xét 3x = 0 \(\Rightarrow\) x = 0
\(x-\frac{2}{5}=0\) \(\Rightarrow\) \(x=\frac{2}{5}\)
Vậy \(x=0\) hoặc \(x=\frac{2}{5}\)
3x(x-2/5)=0
suy ra:3x=0 hoặc x-2/5=0
x=0:3hoacx =0+2/5
x=0 hoacx =2/5
vay x=0 hoac x=2/5
\(3x\left(x-\frac{2}{5}\right)=0\)
\(3x^2-3.\frac{2}{5}=0\)
\(3x^2-\frac{6}{5}=0\)
\(3x^2=\frac{6}{5}\)