题目内容
分解因式:
(1)-4x2+12xy-9y2;
(2)
ab2-2a.
(1)-4x2+12xy-9y2;
(2)
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| 2 |
(1)-4x2+12xy-9y2,
=-(4x2-12xy+9y2),
=-(2x-3y)2;
(2)
ab2-2a,
=
a(b2-4),
=
a(b+2)(b-2).
=-(4x2-12xy+9y2),
=-(2x-3y)2;
(2)
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| 2 |
=
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| 2 |
=
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| 2 |
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