a) \(x.\left(x-13\right)=0\)
\(\Rightarrow x=0\) hoặc \(x-13=0\)
+) \(x=0\)
+) \(x-13=0\Rightarrow x=13\)
Vậy \(x\in\left\{0;13\right\}\)
b) \(\left(x-1\right).\left(3x-15\right)=0\)
\(\Rightarrow x-1=0\) hoặc \(3x-15=0\)
+) \(x-1=0\Rightarrow x=1\)
+) \(3x-15=0\Rightarrow3x=15\Rightarrow x=5\)
Vậy \(x\in\left\{0;5\right\}\)
\(x\left(x-13\right)=0\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x-13=0\end{array}\right.\)\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0\\x=13\end{array}\right.\)
\(\left(x-1\right)\left(3x-15\right)=0\)
\(\Leftrightarrow\left[\begin{array}{nghiempt}x-1=0\\3x-15=0\end{array}\right.\)\(\Leftrightarrow\left[\begin{array}{nghiempt}x=1\\x=5\end{array}\right.\)
