б) a+b-a^2+b^2=

= (a+b)-(a^2-b^2)=

=(a+b)-(a-b)(a+b)=

=(a+b)(1-a+b)

г) m-m^2-n+n^2=

=(m-n)-(m^2-n^2)=

=(m-n)(1-m-n)

б) b^2-bc-a^2+ac=

=-a^2+ab-ab+b^2+ac-bc=

=-(a^2-ab)-(ab-b^2)+(ac-bc)=

=-a(a-b)-b(a-b)+c(a-b)=

=(a-b)(c-a-b)

г) - не понятная запись

б) xy^2+x^2y-x^3-y^3=

=(xy^2-y^3)-(x^3-x^2y)=

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

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

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

г) a^3-3a^2b+3ab^2-b^3=

=(a^3-b^3)-(3a^2b-3ab^2)=

=(a-b)(a^2+ab+b^2)-(a-b)3ab=

=(a^2+ab+b^2-3ab)(a-b)=

=(a^2-2ab+b^2)(a-b)=

=(a-b)^2(a-b)=

=(a-b)^3

Verified answer

895

б) (b-a+1)(b+a)

г) (n-m)(n+m-1)

896

б) (a-b)(c-b-a)

г) (x-1)(x+y)(y-1)(y+1)

897

б) (-y^2+2xy-x^2)(y+x)

г) -(b-a)^3