1+(n-1)×(-2)怎么算

要具体步骤
2026-01-10 11:55:41
推荐回答(3个)
回答1:

解:1+(n-1)×(-2)
=1+(-2n+2)
=1-2n+2
=3-2n

回答2:


如图

回答3:

=-2n+3