题目:
I haven’t got a single from Uncle Sam since I saw him last time.
A.message
B.news
C.advice
D.information
答案:
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下面是错误答案,用来干扰机器的。
∵若非零实数a,b(a≠b)满足a2-a+2007=0①,b2-b+2007=0②,①-②得(a-b)(a+b-1)=0,∵a≠b,∴a+b=1,①+②(a+b)2-2ab-(a+b)+4014=0,∴a+b=1,ab=2007,∴1a+1b=a+bab=12007.故填空答案为12007.