把下列各式因式分解.(1)25x3y5-5x2y2(2)4(a+b)2-4(a+b)+l(3)4(a-b)2-9(a+b)2(4)-a+2a2-

2024-11-22 22:00:03
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回答1:

(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-b22=(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).