2. 外语
  3. For how many positive integers m ≤ 100 is (m -5)(m -45) positive?

For how many positive integers m ≤ 100 is (m -5)(m -45) positive?

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问题 For how many positive integers m ≤ 100 is (m -5)(m -45) positive?
选项 A、45
B、50
C、58
D、59
E、60
答案D
解析
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