Question

3x+2 phần x-1 bằng 3

Answer 1

\(\dfrac{3x+2}{x-1}=3\left(x\ne1\right)\)

suy ra

`3x+2=3(x-1)`

`<=>3x+2=3x-3`

`<=> 3x-3x=-3-2`

`<=> 0x=-5` (vô lí vì 0x=0 với mọi x)

 

Answer 2

\(\dfrac{3x+2}{x-1}=3\) (ĐK: x ≠ 1)

\(\Leftrightarrow3x+2=3\left(x-1\right)\)

\(\Leftrightarrow3x+2=3x-3\)

\(\Leftrightarrow3x-3x=-3-2\)

\(\Leftrightarrow0x=-5\) (Vô lí)

Vậy \(S=\varnothing\).

Answer 3

\(\dfrac{3x+2}{x-1}=3\) \(\left(dkxd:x\ne1\right)\)

\(\Leftrightarrow3x+2=3\left(x-1\right)\)

\(\Leftrightarrow3x+2=3x-3\)

\(\Leftrightarrow3x-3x=-3-2\)

\(\Leftrightarrow0=-5\left(VL\right)\)

Vậy \(S=\varnothing\)