1.How many different prime numbers are factors of the positive integer n? (1) four different prime numbers are factors of 2n . (2) four different prime numbers are factors of n^2 .
2. Lines n and p lie in the xy-plane. Is the slope of line n less than the slope of line p ? (1) Lines n and p interact at the point (5,1) . (2) The y-intercept of line n is greater than the y-intercept of line p.
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发表于 2011-12-3 17:59:54
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