题目内容
分解因式:
(1)(a+b)2-4ab;
(2)3ax2-3ay2.
(1)(a+b)2-4ab;
(2)3ax2-3ay2.
(1)(a+b)2-4ab,
=a2+2ab+b2-4ab,
=a2-2ab+b2,
=(a-b)2;
(2)3ax2-3ay2,
=3a(x2-y2),
=3a(x+y)(x-y).
=a2+2ab+b2-4ab,
=a2-2ab+b2,
=(a-b)2;
(2)3ax2-3ay2,
=3a(x2-y2),
=3a(x+y)(x-y).
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