挑战习题
1/5单选题
难度:

1.如图,抛物线y=ax2-5ax+4经过△ABC的三个顶点,已知BC∥x轴,点A在x轴上,点C在y轴上,且AC=BC. 若点P是抛物线对称轴上且在x轴下方的动点,使△PAB是等腰三角形时p点有()个。
A 1
B 2
C 3
D 4
提示1:
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正确答案:Qw==
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