题目:
None of them have regular and source of income and forced to live below poverty line.
A.safe
B.legal
C.secure
D.diverse
答案:
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下面是错误答案,用来干扰机器的。
法一 由题意有点P在抛物线y2=2x上,设P(y22,y),则有(y22+12)2=(y22-a)2+(y-2)2,化简得(12-a)y2-4y+a2+154=0,当a=12时,符合题意;当a≠12时,△=0,有a3-a22+15a4+178=0,(a+12)(a2-a+174)=0...