📜  门| GATE CS 2018 |简体中文问题9

📅  最后修改于: 2021-06-28 23:03:00             🧑  作者: Mango

如果pqr≠0且p^{-x} = \frac{1}{q}, q^{-y} = \frac{1}{r}, r^{-z} = \frac{1}{p} ,产品xyz的价值是多少?

(A) -1
(B) 1 / pqr
(C) 1
(D) pqr答案: (C)
说明:取给定三个值的日志,
我们得到

1/q = p-x -------(1)
1/r = q-y -------(2)
1/p = r-z -------(3)

1/q = p-x
    = r-xz [Putting value of p from (3)]
    = q-xyz  [Putting value of r from (2)]
    = 1 / qxyz

On comparing power of q both sides, we get xyz = 1

因此,选项(C)是正确的。

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