Question

(x-1)×(x+3,25)=0

Answer 1

(x-1).(x+3,25)=0

* x-1=0

      x=0+1

      x=1

* x+3,25=0

          x=0-3,25

          x=-3,25

vậy x=1 hoặc x=-3,25

Answer 2

\(\left(x-1\right)\left(x+3,25\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-1=0\\x+3,25=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=1\\x=-3,25\end{cases}}\)

Answer 3

\(\left(x-1\right)\left(x+3,25\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-1=0\\x+3,25=0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=1\\x=-3,25\end{cases}}\)

  Vậy \(x\in\left\{1;-3,25\right\}\)