2. 外语
  3. If the value of the expression above is to be halved by doubling exactly one of the five numbers a, b, c, d, or e, which should

If the value of the expression above is to be halved by doubling exactly one of the five numbers a, b, c, d, or e, which should

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问题
If the value of the expression above is to be halved by doubling exactly one of the five numbers a, b, c, d, or e, which should be doubled?
选项 A、a
B、b
C、c
D、d
E、e
答案D
解析 若要通过加倍a，b，c，d和e这五个数中某一个数而使上面表达式的值减半，问应当加倍哪一个数?
解：本题的正确答案是(D)。这道题中的表达式是个繁分式，要使分式的值减半，要么使分母的值加倍，要么使分子的值减半。而本题的要求是通过加倍某个数的方法使整个分式的值减半，所以就要从分式的分母d/e入手。要使d/e的值加倍，只有使d的值加倍。
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