\(\Leftrightarrow3^{4-x}=3^{-3}\Leftrightarrow4-x=-3\Leftrightarrow x=7\)
Đúng 2
Bình luận (1)
\(\Leftrightarrow3^{4-x}=3^{-3}\Leftrightarrow4-x=-3\Leftrightarrow x=7\)
a) 3^2x-1=243
b) 3^x+1=9^x
c) (4/7-1/2x)^3=-8/34
Tìm x :
1/ \(\frac{x^7}{81}=27\)
2/ \(\left(x^4\right)^2=\frac{x^{12}}{x^5}\)
3/ \(x^{10}=25.x^8\)
4/ \(\left(3x-1\right)^3=\frac{-8}{27}\)
Tim x
a, 2(x- 1/3)+3x=7/4
b, x-1/3 == 27/x-1
c, 2x +1/x+3= 2x+3/ x +5
Tick nha!
Tìm x biết 3^4 <1/9×27^x < 3^10
Tìm x biết: 3x+1. 9x+2.27x = 81x
tìm x ϵ N biết: \(\left(x-\dfrac{1}{2}\right)^3=\dfrac{1}{27}\)
Tìm x biết : a) x+3/22=-27/121.11/9 b) (3và2/20-2và1/20)x+2/7=3/5 c) |3/2x-5|-1/2=-1/4
Tìm x biết: -5,6.x + 16,2 = 34.x
Tim x
\(\left(3x+1\right)^3=27\)