a:1=2:(a-1)
a=-1正确答案是a=2或a=-1噢，我解错了a:1=2:(a-1)a(a-1)-2=0a^2-a-2=0(a-2)(a+1)=0a=2,a=-1
直线ax+2y-1=0与x+(a-1)y+2=0平行,则a等于
直线ax+2y-1=0与x+(a-1)y+2=0平行,则a等于
数学人气：428 ℃时间：2019-12-17 10:08:15
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