a) 25-5m-m^3+7m^2 = -m^3+7m^2-5m+25= -m(m^2-7m+5)-25= -m(m-5)(m-5)
б) 8ab^2+a-2b-4a^2b = -4a^2b+8ab^2-a-2b= -a(4ab-1)-b(2+2b)
в) ab^2-6a+b^3-6b-7b^2+42 = b^2(a-7)+b(-6)+(-6a+42)= b^2(a-7)-6(b-7)
г) xy+ax-9y-9a = x(y+a)-9(y+a)= (x-9)(y+a)
д) xy-5x+2y-10 = x(y-5)+2(y-5)= (x+2)(y-5)
е) 4ab-6a-2b+3 = 4a(b-2)-2(b-2)= (4a-2)(b-2)
ж) 9a-2b+2b^2-ab+ab^2+18 = (2b^2+ab+9a)-(2b-18)= (2b+a)(b+9)
a) 25-5m-m^3+7m^2 = -m^3+7m^2-5m+25
= -m(m^2-7m+5)-25
= -m(m-5)(m-5)
б) 8ab^2+a-2b-4a^2b = -4a^2b+8ab^2-a-2b
= -a(4ab-1)-b(2+2b)
в) ab^2-6a+b^3-6b-7b^2+42 = b^2(a-7)+b(-6)+(-6a+42)
= b^2(a-7)-6(b-7)
г) xy+ax-9y-9a = x(y+a)-9(y+a)
= (x-9)(y+a)
д) xy-5x+2y-10 = x(y-5)+2(y-5)
= (x+2)(y-5)
е) 4ab-6a-2b+3 = 4a(b-2)-2(b-2)
= (4a-2)(b-2)
ж) 9a-2b+2b^2-ab+ab^2+18 = (2b^2+ab+9a)-(2b-18)
= (2b+a)(b+9)