Question

一道数学题:是分解因式题目:(a-1)(a-2)-ab+3b-2

Answer 1

(a-1)(a-2)-ab+3b-2

=a^2-3a+2-ab+3b-2

=a^2-ab-3a+3b

=a(a-b)-3(a-b)

=(a-3)(a-b)