若整数a、b、c满足(50/27)^a×(18/25)^b×(9/8)^c=8,求a、b、c的值
若整数a、b、c满足(50/27)^a×(18/25)^b×(9/8)^c=8,求a、b、c的值
日期:2021-06-24 22:12:02 人气:1
你好!
(50/27)^a×(18/25)^b×(9/8)^c
= (50^a *18^b *9^c)/ (27^a*25^b*8^c)
= (5^(2a)*2^a*3^(2b)*2*3^(2c))/(3^(3a)*5^(2b)*2^(3c))
= 5^(2a-2b) * 3^(2b+2c - 3a) * 2^(a+1 - 3c)
= 8 = 2^3
所以 2a-2b=0,2b+2c - 3a = 0,a
(50/27)^a×(18/25)^b×(9/8)^c
= (50^a *18^b *9^c)/ (27^a*25^b*8^c)
= (5^(2a)*2^a*3^(2b)*2*3^(2c))/(3^(3a)*5^(2b)*2^(3c))
= 5^(2a-2b) * 3^(2b+2c - 3a) * 2^(a+1 - 3c)
= 8 = 2^3
所以 2a-2b=0,2b+2c - 3a = 0,a