2. 外语
  3. In the equation above, k, r, s, t, and v represent positive numbers. Multiplying which one of these numbers by 2 will reduce the

In the equation above, k, r, s, t, and v represent positive numbers. Multiplying which one of these numbers by 2 will reduce the

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问题
In the equation above, k, r, s, t, and v represent positive numbers. Multiplying which one of these numbers by 2 will reduce the value of n to 1/2 of its present value ?
选项 A、k
B、r
C、s
D、t
E、v
答案D
解析 在左面方程中，k，r，s，t和v都是正数(positive number)，其中哪个数乘以2将使n值减少到某前值的1/2?
解：本题的正确答案为(D)。n是一个分式，要使一个分式的值减小一半，要么使分式的分子的值减小一半，要么使分式的分母的值增加一倍。本题所给出的繁分式的分母为上，因此只有把t的值增加一倍，才能使n的值减小一半。
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