Question

Ét ở ét

Answer 1

Bài 3: 

1: \(\Leftrightarrow2x^2+4x-x-2-2x^2-2x=0\)

=>x-2=0

hay x=2

2: \(\Leftrightarrow x^2-4-x^2-x=3\)

=>-x=7

hay x=-7

Answer 2

Bài 3.

`1)`\(\left(2x-1\right)\left(x+2\right)-2x\left(x+1\right)=0\)

`<=>2x^2+4x-x-2-2x^2-2x=0`

`<=>x-2=0`

`<=>x=2`

Vậy `x=2`

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

`<=>x^2-4-x^2-x=3`

`<=>-x=7`

`<=>x=-7`

Vậy `x=-7`