1) \(x^2\left(x-1\right)+16\left(1-x\right)\)

\(=x^2\left(x-1\right)-16\left(x-1\right)\)

\(=\left(x^2-16\right)\left(x-1\right)\)

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

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

2)\(81x^2-6yz-9y^2-z^2\)

\(=81x^2-9y^2-6yz-z^2=81x^2-\left(9y^2+6yz+z^2\right)=81x^2-\left(\left(3y\right)^2+6yz+z^2\right)\)

\(=81x^2-\left(3y+z\right)^2=\left(9x\right)^2-\left(3y+z\right)^2\)

\(=\left(9x+3y+z\right)\left(9x-\left(3y+z\right)\right)=\left(9x+3y+z\right)\left(9x-3y-z\right)\)

3)\(xz-yz-x^2+2xy+y^2\)

\(=z\left(x-y\right)-\left(x^2-2xy+y^2\right)\)

\(=z\left(x-y\right)-\left(x-y\right)^2=\left(z+x-y\right)\left(x-y\right)\)

chịu@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

\(3a^2-6ab+3b^2-12c^2\)

\(=3\left(a^2-2ab+b^2-4c^2\right)\)

\(=3\left(\left(a-b\right)^2-\left(2c\right)^2\right)\)

\(=3\left(a-b-2c\right)\left(a-b+2c\right)\)

mình đâu có ngu bạn

ok mình kết bạn vs bạn

ko hỉu@@@@@@@@@@@@@@@@

I DON'T KNOW

x² - y² - 2x + 2y

= (x - y)(x + y) - 2(x - y)

= (x + y - 2)(x - y)

(x-y)(y+x-2)

chịu!@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

a³x-ab+b-x

=x(a³-1)-b(a-1)

=(a-1)(xa²+xa+x-b)

BIẾT CHẾT LIỀN

ok.bn k mk nha

kb  v ớ i mik nha mik kb rùi

x+y=2=> y=2-x  {cach co ban nhat}

y^2=(2-x)^2=4-4x+x^2

N=x^2+y^2=x^2+(4-4x+x^2)

N=2x^2-4x+4

N=2(x^2-2x+2)

{tach ghep BP}

\(N=2.\left[\left(x^2-2.x+1^2\right)+2-1\right]\)

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

N\(\ge\)2(2-1)=2

dang thuc xay ra khi x=1; y=1

bn tl đúng rùi