(1)0.25-a^2 (2)9a^2-25b^2c^4 (3)a-6a^2b^3+9a^3b^6 (4)2acd-c^2a-ad^2

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(1)0.25-a^2 (2)9a^2-25b^2c^4 (3)a-6a^2b^3+9a^3b^6 (4)2acd-c^2a-ad^2
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(1)0.25-a^2 (2)9a^2-25b^2c^4 (3)a-6a^2b^3+9a^3b^6 (4)2acd-c^2a-ad^2
(1)0.25-a^2 (2)9a^2-25b^2c^4 (3)a-6a^2b^3+9a^3b^6 (4)2acd-c^2a-ad^2

(1)0.25-a^2 (2)9a^2-25b^2c^4 (3)a-6a^2b^3+9a^3b^6 (4)2acd-c^2a-ad^2
(1)0.25-a^2=(0.5+a)(0.5-a)
(2)9a^2-25b^2c^4 =(3a)^2-(5bc^2)^2=(3a+5bc^2)(3a-5bc^2)
(3)a-6a^2b^3+9a^3b^6=a(1-6ab^3+9a^2b^6)=a(1-3ab^3)^2
(4)2acd-c^2a-ad^2 =a(2cd-c^2-d^2)=-a(c-d)^2.

没有悬赏分吗?这么多!