\(1,\\ a,=4\left(x-2\right)^2+y\left(x-2\right)=\left(4x-8+y\right)\left(x-2\right)\\ b,=3a^2\left(x-y\right)+ab\left(x-y\right)=a\left(3a+b\right)\left(x-y\right)\\ 2,\\ a,=\left(x-y\right)\left[x\left(x-y\right)^2-y-y^2\right]\\ =\left(x-y\right)\left(x^3-2x^2y+xy^2-y-y^2\right)\\ b,=2ax^2\left(x+3\right)+6a\left(x+3\right)\\ =2a\left(x^2+3\right)\left(x+3\right)\\ 3,\\ a,=xy\left(x-y\right)-3\left(x-y\right)=\left(xy-3\right)\left(x-y\right)\\ b,Sửa:3ax^2+3bx^2+ax+bx+5a+5b\\ =3x^2\left(a+b\right)+x\left(a+b\right)+5\left(a+b\right)\\ =\left(3x^2+x+5\right)\left(a+b\right)\\ 4,\\ A=\left(b+3\right)\left(a-b\right)\\ A=\left(1997+3\right)\left(2003-1997\right)=2000\cdot6=12000\\ 5,\\ a,\Leftrightarrow\left(x-2017\right)\left(8x-2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2017\\x=\dfrac{1}{4}\end{matrix}\right.\\ b,\Leftrightarrow\left(x-1\right)\left(x^2-16\right)=0\Leftrightarrow\left[{}\begin{matrix}x=1\\x=4\\x=-4\end{matrix}\right.\)

Bài 1: 

a: \(4a^2-6b=2\left(2a^2-3b\right)\)

b: \(m^3n-2m^2n^2-mn\)

\(=mn\left(m^2-2mn-1\right)\)

Bài 1:

a) \(4a^2-6b=2\left(a^2-3b\right)\)

b) \(=mn\left(m^2-2mn-1\right)\)

Bài 2:

a) \(=4\left(u-2\right)^2+v\left(u-2\right)=\left(u-2\right)\left(4u-8+v\right)\)

b) \(=a\left(a-b\right)^3-b\left(a-b\right)^2-b^2\left(a-b\right)=\left(a-b\right)\left[a\left(a-b\right)^2-b\left(a-b\right)-b^2\right]=\left(a-b\right)\left(a^3-2a^2b+ab^2-ab+b^2-b^2\right)=\left(a-b\right)\left(a^3-2a^2b+ab^2-ab\right)\)

1: \(\dfrac{A}{B}=\dfrac{2x^4+4x^3-x^3-2x^2-2x^2-4x+x+2}{x+2}\)

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

Ta có : \(\left(a+b+c\right)^3-4\left(a^3+b^3+c^3\right)-12abc\)

\(=a^3+b^3+c^3+3\left(a+b\right)\left(a+c\right)\left(b+c\right)-4\left(a^3+b^3+c^3\right)-12abc\)

\(=-3\left(a^3+b^3+c^3\right)+3\left(a+b\right)\left(a+c\right)\left(b+c\right)-12abc\)

\(=-3\left[a^3+b^3+c^3-\left(a+b\right)\left(a+c\right)\left(b+c\right)+4abc\right]\)

\(=-3\left(a^3+b^3+c^3-c^2b-c^2a-b^2c-a^2c-ab^2-6abc\right)\)

\(=-3\left(c-b-a\right)\left(c-b+a\right)\left(c+b-a\right)\)

-3(a+b+c)(a^2-2ab+b^2-2ac-2bc+c^2)

a) (x + 1)(x + 2)(x + 3)(x + 4) - 24

= [(x + 1)(x + 4)].[(x + 2)(x + 3)] - 24

= (x² + 5x + 4)(x² + 5x + 6) - 24 

= (x² + 5x + 5 - 1)(x² + 5x + 5 + 1) - 24

= (x² + 5x + 5)² - 1 - 24 = (x² + 5x + 5)² - 25 

= (x² + 5x)(x² + 5x + 10) 

 = x(x + 5)(x² + 5x + 10)

Câu 1:

a: Sửa đề: \(A=\left(x+2\right)\left(x^2-2x+4\right)+x\left(1-x\right)\left(1+x\right)\)

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

\(=x^3+8+x-x^3\)

=x+8

b: Khi x=-4 thì A=-4+8=4

c: Đặt A=-2

=>x+8=-2

=>x=-10

Câu 2:

a: \(x^3-3x^2=x^2\cdot x-x^2\cdot3=x^2\left(x-3\right)\)

b: \(5x^3+10x^2+5x\)

\(=5x\cdot x^2+5x\cdot2x+5x\cdot1\)

\(=5x\left(x^2+2x+1\right)\)

\(=5x\left(x+1\right)^2\)

a/ \(\left(a^2-b^2+1\right)\left(a^2-ab+b^2\right)\left(a^2+ab+b^2\right)\)

b/ \(\left(x+y-1\right)\left(y^2-xy+y+x^2+x+1\right)\)