直线ax+2y-1=0与x+(a-1)y+2=0平行,则a的值为( ):A.-1/2 B.3/2 C.-2或1 D.-1或2

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问题 直线ax+2y-1=0与x+(a-1)y+2=0平行,则a的值为( ):

选项 A.-1/2
B.3/2
C.-2或1
D.-1或2

答案D

解析
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