пж помогите номер 31.17 на данный момент надобно

1) m - n - m + n = (m-n)*(m+n) - (m-n) = (m-n) * (m+n-1)

2) 9x - 4y - 3x + 2y = -(4y - 9x) - 3x + 2y = -(2y-3x) * (2y+3x) - 3x + 2y = (2y - 3x) * (1 - (2y+3x)) = (2y-3x) * (1-2y-3x)

3) x + 3x - 4x - 12 = x * (x+3)- 4 (x+3) = (x+3) * (x - 4) = (x+3) * (x-2) * (x+2)

4) 81 - (3-8y)=(9-(3-8у))(9+(3-8у))=(6+8у)(12-8У)

5) (x+5)-16=(х+5-4)(х+5+4)=(х+1)(х+9)

6) 36-(y+1)=(6-(у+1))(6+у+1)=(5-у)(7+у)

7) (3x-7)-25=(3х-7-5)(3х-7+5)=(3х-12)(3х-2)=3*(х-4)(3х-2)

8) (4 - 5x) - 64 = (4 - 5x) - 8 =  ( 4 - 5x - 8) ( 4 - 5x + 8) =  ( - 4 - 5x) ( 12 - 5x) = - ( 4 + 5x) (12 - 5x)