Question

Answer 1

\(\dfrac{x^2-x}{2\left(x-1\right)}=\dfrac{x\left(x-1\right)}{2\left(x-1\right)}=\dfrac{x}{2}\\ =>B\)

Answer 2

\(\dfrac{x^2-x}{2\times\left(x-1\right)}=\dfrac{x\times\left(x-1\right)}{2\times\left(x-1\right)}=\dfrac{x}{2}\)

\(\Rightarrow ChonB\)

Answer 3

\(\dfrac{x^2-x}{2\left(x-1\right)}=\dfrac{x\left(x-1\right)}{2\left(x-1\right)}=\dfrac{x}{2}\)

=> Chọn B