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[img]ct_2image034[/img]In the equation above, k, r, s, t, and v represent posit
[img]ct_2image034[/img]In the equation above, k, r, s, t, and v represent posit
游客
2024-01-12
29
管理
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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