Question

(2x-1)(x²-x+1)=2x³-3x²+2

Tl giúp em với ạ

Answer 1

\(2x^3-2x^2+2x-x^2+x-1=2x^3-3x^2+2\\ \text{⇔}3x=3\\ \text{⇔}x=1\)

Answer 2

Lần sau ghi rõ đề ra nhé!

\(pt\Leftrightarrow2x^3-2x^2+2x-x^2+x-1=2x^3-3x^2+2\\ \Leftrightarrow3x=3\Leftrightarrow x=1\)

Vậy \(S=\left\{1\right\}\)

Answer 3

2x3−2x2+2x−x2+x−1=2x3−3x2+2⇔3x=3⇔x=1

Answer 4

Ta có: \(\left(2x-1\right)\left(x^2-x+1\right)=2x^3-3x^2+2\)

\(\Leftrightarrow2x^3-2x^2+2x-x^2+x-1-2x^3+3x^2-2=0\)

\(\Leftrightarrow3x=3\)

hay x=1