a)
`32/2^n =2`
`=> 32:2^n=2`
`=> 2^n= 32:2`
`=> 2^n= 16`
`=> 2^n= 2^4`
`=> n=4`
(câu này mik lm đầy đủ cho bn dễ hỉu nè câu sau tương tự nên mik lm tắt hơn nhé)
b)
`8^n/2^n=6`
`=> (8/2)^n = 16`
`=> 4^n = 16`
`=> 4^n = 4^2`
`=> n=2`
d)
`54/3^(n-2) =2`
`=> 3^(n-2)= 54:2`
`=> 3^(n-2)= 27`
`=> 3^(n-2)= 3^3`
`=> n-2=3`
`=> n=5`
e)
`175/5^(n+1)=7`
`=>5^(n+1) = 175/7`
`=>5^(n+1)= 25`
`=>5^(n+1)= 5^2`
`=> n+1=2`
`=> n=1`
g)
`64/2^(n+1)=8`
`=> 2^(n+1)= 64:8`
`=> 2^(n+1)= 8`
`=> 2^(n+1)= 2^3`
`=> n+1=3`
`=> n=2`
h)
`3^8/3^n = 3^20`
`=> 3^n= 3^8:3^20`
`=> 3^n= 3^(8-20)`
`=> 3^n= 3^(-12)`
`=> n= -12`
j)
`5^5/5^n= 5^18`
`=> 5^n= 5^5:5^18`
`=> 5^n= 5^(5-18)`
`=> 5^n= 5^(-13)`
`=> n=-13`
k)
`2^3/2^n=4^5`
`=> 2^3/2^n= 2^10`
`=> 2^n = 2^3:2^10`
`=> 2^n = 2^(3-10)`
`=> 2^n= 2^(-7)`
`=> n=-7`
--Chưa hiểu chỗ nào hỏi mik nhé ^^--
