\(\frac{3^{-m}}{81}=27\)
\(\frac{3^{-m}}{3^4}=3^3\)
\(3^{-m}=3^3\times3^4\)
\(3^{-m}=3^7\)
\(-m=7\)
\(m=7\)
3-m = 37
1/3m = 37
3m +7 = 1 = 3o
m= -7
tài năng toán học đặng yến linh
Find m: \(\frac{3^{-m}}{81}=27\)
1- \(\frac{2}{3}-\frac{2}{9}-\frac{2}{27}-\frac{2}{81}-\frac{2}{243}\)
ind such that
.
Answer:
\(\frac{125^{2^{ }}.5^4}{25^{4^{ }}}\)
\(\frac{81^{2^{ }}.27^3}{9^8}\)
3-m:81=27
Tìm x, biết
a,\(\frac{\left(-3\right)^x}{81}=-27\)
b,\(1\frac{1}{2}\cdot x-4=0,5\)
c,\(2^{x-1}=16\)
Tìm n∈Z biết :
a,27n/3n
b,\(\frac{25}{5^n}\)=5
c,\(\frac{81}{\left(-3\right)^n}=-243\)
d,\(\frac{1}{2}\cdot2^n+4\cdot2^n=9\cdot2^5\)
e,(\(\frac{1}{3}\))n=\(\frac{1}{81}\)
f,\(\left(\frac{-3}{4}\right)^n=\frac{81}{256}\)
g,\(\frac{-512}{343}=\left(\frac{-8}{7}\right)^n\)
h,5-1*25n=125
k,3-1*3n+6*3n-1=7*36
Tìm x :
27 mũ x phần 3 mũ x = 81
Tìm x :
a, \(3^x=9^{-6}.27^{-5}81^8\)
