题目内容
因式分
(1)3a2-27
(2)-4a2x2+8ax-4.
(1)3a2-27
(2)-4a2x2+8ax-4.
(1)3a2-27,
=3(a2-9),
=3(a+3)(a-3);
(2)-4a2x2+8ax-4,
=-4(a2x2-2ax+1),
=-4(ax-1)2.
=3(a2-9),
=3(a+3)(a-3);
(2)-4a2x2+8ax-4,
=-4(a2x2-2ax+1),
=-4(ax-1)2.
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