\(1,=x\left(x^2-2x+1-y^2\right)=x\left[\left(x-1\right)^2-y^2\right]=x\left(x-y-1\right)\left(x+y-1\right)\\ 2,=\left(x+y\right)^3\\ 3,=\left(2y-z\right)\left(4x+7y\right)\\ 4,=\left(x+2\right)^2\\ 5,Sửa:x\left(x-2\right)-x+2=0\\ \Leftrightarrow\left(x-2\right)\left(x-1\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=2\end{matrix}\right.\)

câu 2: c,4x^4 y^4

\(2,B\\ 3,D\\ 4,D\\ 5,B,C\\ 6,A\\ 7,C\\ 8,A\)

1D  2C

Câu 1: D

Câu 2: C

a) \(=\left(2x-1\right)^2\)

b) \(=x\left(y^2-x^2+2x-1\right)=x\left[y^2-\left(x-1\right)^2\right]=x\left(y-x+1\right)\left(y+x-1\right)\)

a. \(4x^2-4x+1=\left(2x\right)^2-2x.2.1+1^2=\left(2x-1\right)^2\)

b. \(xy^2-x^3+2x^2-x=x\left(y^2-x^2+2x-1\right)=x\left[y^2-\left(x^2-2x+1\right)\right]=x\left[y^2-\left(x-1\right)^2\right]=x\left(y-x+1\right)\left(y+x-1\right)\)

x³-3x²-4x+12=(x³-3x²)-(4x-12)=x²(x-3)-4(x-3)=(x-3)(x²-4)=(x-3)(x-2)(x+2)

\(x^3-3x^2-4x+12=\left(x^3-3x^2\right)-\left(4x-12\right)\\ =x^2\left(x-3\right)-4\left(x-3\right)=\left(x-3\right)\left(x^2-4\right)\\ =\left(x-3\right)\left(x-2\right)\left(x+2\right)\)

\(x^3-3x^2-4x+12\)

\(=\left(x^3-3x^2\right)-\left(4x-12\right)\)

\(=x^2\left(x-3\right)-4\left(x-3\right)\)

\(=\left(x-3\right)\left(x^2-4\right)\)

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

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

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

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

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

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

\(\Leftrightarrow x^4+x^3-5x^3+x^2-5x^2+2x^2-5x+2x+2\)

\(\Leftrightarrow x^4+x^3+x^2-5x^3-5x^2-5x+2x^2+2x+2\)

\(\Leftrightarrow x^2\left(x^2+x+1\right)-5x\left(x^2+x+1\right)+2\left(x^2+x+1\right)\)

\(\Leftrightarrow\left(x^2-5x+2\right)\left(x^2+x+1\right)\)

Xin tick ạ !!!

a/ (x - 1)(x - √3 + 2)(x + √3 + 2)

a ) \(x^3+3x^2-3x+1\)

    \(=x^3-3x+3x^2-1\)

     \(=\left(x-1\right)^3\)

c/ (x + 1)(x + \(\frac{\sqrt{21}-5}{2}\))(x + \(\frac{-\sqrt{21}-5}{2}\))