Question

Bài mik để dưới phần trả lời ạ

Answer 1

  ạ

Answer 2

14

\(=\left(x-3\right)^3+3^3=\left(x-3+3\right)\left[\left(x-3\right)^2-\left(x-3\right).3+3^2\right]\\ =x\left(x^2-6x+9-3x+9+9\right)=x\left(x^2-9x+27\right)\)

Answer 3

3: =-(x^2-10x+25)

=-(x-5)^2

5: 16-x^2=(4-x)(4+x)

6: 16-(3x+1)^2

=(4-3x-1)(4+3x+1)

=(3x+5)*3(1-x)

7: =(2x+5+3x)(2x+5-3x)

=(5-x)*5*(x+10

8: =(2x-1-3x+1)(2x-1+3x-1)

=-x(5x-2)

9: =(2x-y)^2

10: =(x+1+3y)(x+1-3y)

12: =(y-2)^2-x^2

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