\(x^2-4x+3=0\)

\(\Leftrightarrow x^2-x-3x+3=0\)

\(\Leftrightarrow x\left(x-1\right)-3\left(x-1\right)=0\)

\(\Leftrightarrow\left(x-1\right)\left(x-3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=3\end{matrix}\right.\)

B

Hoá tiếng anh à ?

Iron: Sắt, CTHH: Fe

Sodium: Natri, CTHH: Na

Copper: Đồng, CTHH: Cu

Copper(II) Oxide: Đồng(II) Oxit, CTHH: CuO

?

\(4x\left(2-x\right)+\left(2x+1\right)^2=2\)

\(\Leftrightarrow8x-4x^2+4x^2+4x+1=2\)

\(\Leftrightarrow12x=1\)

\(\Leftrightarrow x=\dfrac{1}{12}\)

Hình như là \(y^2\) ?

a. \(\left(x^2y-2xy\right)\left(-3x^2y\right)=-3x^4y^2+6x^3y^2\)

b. \(x^2\left(x-y\right)+y\left(x^2+y\right)=x^3-x^2y+x^2y+y^2=x^3+y^2\)

A

D. -1