Question

(x-1).(x-3)=0

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

x.(x+1)=0

Answer 1

a) (x-1).(x-3)=0

\(\Rightarrow\left\{\begin{matrix}x-1=0\\x-3=0\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}x=1\\x=3\end{matrix}\right.\)

Vậy x = 1; x = 3

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

\(\Rightarrow\left\{\begin{matrix}3-x=0\\x-3=0\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}x=3\\x=3\end{matrix}\right.\)

Vậy x = 3

c) x.(x+1)=0

\(\Rightarrow\left\{\begin{matrix}x=0\\x+1=0\end{matrix}\right.\Leftrightarrow\left\{\begin{matrix}x=0\\x=-1\end{matrix}\right.\)

Vậy x = 0; x = -1

Answer 2

\(\left(x-1\right).\left(x-3\right)=0\)

\(\Rightarrow\left[\begin{matrix}x-1=0\\x-3=0\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=1\\x=3\end{matrix}\right.\)

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

\(\Rightarrow\left[\begin{matrix}3-x=0\\x-3=0\end{matrix}\right.\Rightarrow x=3\)

\(x.\left(x+1\right)=0\)

\(\Rightarrow\left[\begin{matrix}x=0\\x-1=0\end{matrix}\right.\Rightarrow\left[\begin{matrix}x=0\\x=1\end{matrix}\right.\)

Answer 3

Có \(\left(x-1\right).\left(x-3\right)\)

\(\Rightarrow\begin{matrix}x-1=0\\x-3=0\end{matrix}\)\(\Rightarrow\begin{matrix}x=1\\x=3\end{matrix}\)

Vậy x=1 hoặc x=3

Answer 4

(x-1).(x-3)=0

x - 1 = 0 hoặc x - 3 = 0

x = 0 +1 hoặc x = 0 + 3

x = 1 hoặc x = 3

Vậy x = 1 hoặc x = 3

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

3 - x = 0 hoặc x - 3 = 0

x = 0 +3 hoặc x = 0 + 3

x = 3 hoặc x = 3

x.(x+1)=0

x = 0 hoặc x + 1 = 0

x = 0 hoặc x = 0 - 1

x = 0 hoặc x = -1

Vậy x = 0 hoặc x = -1

Answer 5

x(x+1)=0 suy ra x chỉ có thể =0