问题 解答题

因式分解

(1)3x3-12xy2          

(2)(x-1)(x-3)-8.

答案

(1)3x3-12xy2

=3x(x2-4y2

=3x(x+2y)(x-2y);

(3(x-1)(x-3)-8

=x2-4x+3-8

=x2-4x-5

=(x+1)(x-5).

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