Разложите множители на многочлен

 N4 1)=c³(ac+a-1)   3)=-((5xy+15x)-(40y+120)=  -5x(y+3)-40(y+3)=  (y+3)(-5x-40)=-5(y+3)(x+8)    4)= (x³-x²y)+(x²-xy)= x²(x-y)+x(x-y)= (x-y)(x²+x)= x(x-y)(x+1)
  N51)= (a²-b²)-(a-b)= (a-b)(a+b)-(a-b)= (a-b)(a+b-1)  2)=(4m²-n²)+(4m-2n)=
  =(2m-n)(2m+n)+2(2m-n)=(2m-n)(2m+n+2)
   3)=(x²-y²)-(x+y)=(x-y)(x+y)-(x-y)= (x-y)(x+y-1)
   5)=(с²-d²)+(c+d)=(c+d)(c-d)+(c+d)=(c+d)(c-d+1)
 N1)  1)=9(a²-1)=9(a-1)(a+1)   2)=2m(1-m²)=2m(1-m)(1+m)  3)=x²(1-x²)=x²(1-x)(1+x)
   4)= y³(1-y²)=y³(1-y)(1+y)  5)m(x²-y²)=m(x+y)(x-y)
 N2) 1)=(x²-1)(x^4+x²+1)=(x-1)(x+1)(x^4+x²+1)    2)=2(x³-8)=2(x-2)(x²+2x+4)