Question

Tìm x : 

(x-3).(x-5)=0

Answer 1

Ta có : \(\left(x-3\right).\left(x-5\right)=0\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x-3=0\\x-5=0\end{array}\right.\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=0+3\\x=0+5\end{array}\right.\)

\(\Leftrightarrow\left[\begin{array}{nghiempt}x=3\\x=5\end{array}\right.\)

Vậy \(x\in\left\{3;5\right\}\)

Answer 2

\(\left(x-3\right).\left(x-5\right)=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}x-3=0\\x-5=0\end{array}\right.\Leftrightarrow\left[\begin{array}{nghiempt}x=3\\x=5\end{array}\right.\)

vậy \(x=3\) hoặc \(x=5\)

Answer 3

\(\left(x-3\right)\left(x-5\right)=0\)

\(\Rightarrow x-3=0,x-5=0\)

\(\Rightarrow x=3,x-5\)

Answer 4

(x-3).(x-5)=0

ta co : x-3=0  →x=0+3→ x=3

          x-5=0→x=0+5→x=5

vay x=3 hoac x=5