两直线a(a-1)x+y-1=0与直线2x+ay+1=0垂直,
∴ 2a(a-1)*2+1*a=0
∴ 2a²-a=0
∴ a=0或a=1/22a(a-1)*2+1*a=0是怎么来的？我写错了，多输入1个2，答案没错。刚想改两直线a(a-1)x+y-1=0与直线2x+ay+1=0垂直,∴ 2a(a-1)+1*a=0∴ 2a²-a=0∴ a=0或a=1/2其实都一样，那个2a(a-1)+1*a=0是怎么来的忘了！就是A1x+B1y+C1=0和A2x+B2y+C2=0垂直，则 A1A2+B1B2=0