Theo đề ta có:
\(5.3^{3x+2}-27^{x+1}=486\)
\(\Rightarrow5.27^x.9-27^x.27=486\)
\(\Rightarrow27^x\left(45-27\right)=486\)
\(\Rightarrow27^x.18=486\)
\(\Rightarrow27^x=\frac{486}{18}\)
\(\Rightarrow27^x=27\)
\(\Rightarrow27^x=27^1\)
\(\Rightarrow x=1\)
vậy \(x=1\)
a) (2x-1)^3=27
b) (2x-1)^4=81
c) (x-2)^5=-32
d) (3x-1)^4=(3x-1)^6
đ) 5^x +5^x+2=650
g) 3^x-1 +5.3^x-1=162
tìm x
a,3x-1+5.3x-1=162
b,3x+x2=0
c,(x-1).(x-3)<0
Tìm x biết : \(27^5.3^x=9^{10}\)
\(a,\)\(3^x^{-1}+5.3^{x-1}=162\)
\(b,\)\(x-2+3x=10\)
câu b là 2 trường hợp nhé
tìm x
\(3^x+5.3^x=45\)
\(3^{x-1}+5^{x-1}\)
\(2^{3x+2}=4^{x+5}\)
tìm x biết
a, (3x+1)3 = -216
b, 3x-1+5.3x-1=162
Tìm x,y
a) \(\left(x-5\right)^2=\left(1-3x\right)^2\)
b)\(\left(3x-1\right)^{100}+\left(2y+1\right)^{200}\le0\)
Tìm n
\(\frac{1}{3}.3^n+5.3^{n-1}=162\)
1) Tìm các số nguyên x,y,z thỏa mãn : |x-y|+|y-z|+|z-x| =2015
2) Tìm x biết : 3^x-1 + 5.3^x-2 - 3^x + 1/27 =0
3) Chứng minh với mọi STN n khác 0 thì :
a) 1/4+1/4^2+...+1/4^n <1/3
b) 1/3 + 2/3^2 + 3/3^2 +...+ n/3^n < 3/4
Tìm x
(x+1) :\(\dfrac{1}{5}\)=0,8:(x+1)
2|3x+1|-27 = -32
