英语改错题 People say that the world's populations may be seven billion by the year 2010

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• 改错 People say that the world's populations may be seven billion by the year 2010.
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• 已知映射f：A→B=((x,y),x属于R,Y属于R）,f：A中的元素（x,y)对应到B中的元素（3x+y-1,x-2y+1)