请帮忙求满足(8/25)^(-a)*(9/2)^(-b)*(5/3)^(-c)=18的整数a,b,c的值有助于回答者给出准确的答案
问题描述:
请帮忙求满足(8/25)^(-a)*(9/2)^(-b)*(5/3)^(-c)=18的整数a,b,c的值
有助于回答者给出准确的答案
答
(8/25)^(-a)*(9/2)^(-b)*(5/3)^(-c)=18,
18 = 2*3^2 = [(25/8)^a][(2/9)^b][(3/5)^c]
= [5^(2a-c)][3^(c-2b)][2^(b-3a)]
2a - c = 0
c - 2b = 2
b - 3a = 1,
a = -1,
b = -2,
c = -2.