(7m-8n)(x+y)-(3m-2n)(x+y) =(x+y)(4m-6y) 这步我知道,可下步(7m-8n)(x+y)-(3m-2n)(x+y)=(x+y)(4m-6y)这步我知道,可下步为什么还要提2出来
问题描述:
(7m-8n)(x+y)-(3m-2n)(x+y) =(x+y)(4m-6y) 这步我知道,可下步
(7m-8n)(x+y)-(3m-2n)(x+y)
=(x+y)(4m-6y)
这步我知道,可下步为什么还要提2出来
答