\(4^{x+3}-3\cdot4^{x+1}=13\cdot4^{11}\)
\(\Rightarrow4^{x+1}\cdot\left(4^2-3\right)=13\cdot4^{11}\)
\(\Rightarrow4^{x+1}\cdot13=13\cdot4^{11}\)
\(\Rightarrow4^{x+1}=4^{11}\)
\(\Rightarrow x+1=11\)
\(\Rightarrow x=10\)
Vậy \(x=10\)
4x+3 - 3.4x+1 = 13.411
Tìm x
4x+3-3.4x+1=13.411
bài 6 : tìm x :
câu 9, \(3^x=9^{-6}.27^{-5}.81^8\)
câu 18, \(4^{x+3}-3.4^{x+1}=13.4^{11}\)
Tìm x :
\(4^{x+3}-3^{x+1}=13.4^{11}\)
Tìm x biết |2x - 3 |x - 1| | = 11 
Tìm x, biết:
\(x=\dfrac{19}{11}\cdot\dfrac{5}{14}+\dfrac{1}{11}\cdot\dfrac{5}{7}-\sqrt{\dfrac{25}{4}}\cdot\dfrac{2}{11}\)
\(Tìm\) \(x,\) \(biết\) \(:\)
\(a)\frac{x+1}{10}+\frac{x+1}{11}+\frac{x+1}{12}+=\frac{x+1}{13}+\frac{x+1}{14}\\ b)\frac{x+4}{2000}+\frac{x+3}{2001}=\frac{x+2}{2002}+\frac{x+1}{2003}\)
Bài 2 Tìm x biết :
a) -5 | x - 3 | + | 1/2x + 4 | = 7|
b) | 2x + 1 | - 4 | 5 - x | = 9
c) | 9 - | x | = 8
d) - | 2x + 4/3 | - 11 - x | = -7/3
tìm x
a, x+1/10 + x+1/11 + x+1/12 = x+1/13 + x+1/14
b, x+4/2000 + x+3/2001 = x+2/2002 + x+1/2003
