把(x-1)当作一个因式,合并3(x-1)-2(x-1)-5(x-1)的结果是?
问题描述:
把(x-1)当作一个因式,合并3(x-1)-2(x-1)-5(x-1)的结果是?
答
(x-1)(3-2-5)
=(1-x)4
=4-4x