问题 解答题

分解因式:

(1)3x-12x3

(2)x2+y2-1-2xy.

答案

(1)3x-12x3

=3x(1-4x2

=3x(1+2x)(1-2x);

(2)x2+y2-1-2xy

=x2+y2-2xy-1

=(x-y)2-1

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

单项选择题 A1/A2型题
单项选择题