5a-2b+3b-4a-2
问题描述:
5a-2b+3b-4a-2
答
5a-2b+3b-4a-2
=(5a-4a)-(2b+3b)-2
=a-5b-2
5a-2b+3b-4a-2
5a-2b+3b-4a-2
=(5a-4a)-(2b+3b)-2
=a-5b-2