(1)25x3y5-5x2y2=5x2y2(5xy3-1),
(2)4(a+b)2-4(a+b)+l=[2(x+1)]2-2×2(x+1)×1+12=[2(x+1)-1]2=[2x+2-1]2=(2x+1)2,
(3)4(a-b)2-9(a+b)2=[2(a-b)]2-[3(a+b)]2=(-a-5b)(5a+b),
(4)-a+2a2-a3=-a(a2-2a+1)=-a(a-1)2,
(5)-2a3+12a2-16a=-2a(a2-6a+8)=-2a(a-4)(a-2),
(6)a4-2a2b2+b4=(a2-b2)2=(a+b)2(a-b)2,
(7)6y2-11y-10=(2y-5)(3y+2),
(8)a2-1-2ab+b2=(a2-2ab+b2)-1=(a-b)2-1=(a-b+1)(a-b-1).