赞 lawrence89 幼苗
共回答了16个问题采纳率：93.8% 举报
显然,0
1年前 追问
9
(2-x)/(x+1)
=[3-(1+x)]/(x+1)
=3/(x+1)-(x+1)/(x+1)
=-1+3/(x+1)
=[3-(1+x)]/(x+1)
=3/(x+1)-(x+1)/(x+1)
=-1+3/(x+1)
你能帮帮他们吗