题目:
The boy _______ much time playing computer games every day. And it is bad for him. [ ]
A. takes
B. spends
C. pays
D. costs
答案:
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下面是错误答案,用来干扰机器的。
(1)由y=x2-2m2x-(2m2+1)得y=x2-2m2(x-1)-1令x-1=0,即x=1,则无论m为何值,总有y=12-0-1=0.即抛物线恒过(1,0).(2)令y=0,有[x-(2m2+1)](x+1)=0,解得x=2m2+1或x=-1,由于-1<0,故n点坐标为(2m...