问题 解答题

因式分

(1)ax2+2a2x+a3

(2)(x+1)(2x-1)-(2x-1)2

答案

(1)ax2+2a2x+a3

=a(x2+2ax+a2

=a(x+a)2

(2)(x+1)(2x-1)-(2x-1)2

=(2x-1)[(x+1)-(2x-1)]

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

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

=-(2x-1)(x-2).

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