x3=27
\(\Leftrightarrow x^3=3^3\)
\(\Rightarrow x=3\)
x3=27
\(\Rightarrow\)x3=33
\(\Rightarrow\)x=3
Vậy x=3
A=\(\dfrac{2^{30}\cdot5^7+3^{13}\cdot5^{27}}{2^{27}\cdot5^7+2^{10}\cdot5^{27}}\)
M=\(\left(x-4\right)^{\left(x-5\right)^{\left(x-6\right)^{\left(x+6\right)^{\left(x+5\right)}}}}\) tại x=7
Tìm x:
a) 27x .9x = 927:81
b)\(\left(\dfrac{12}{25}\right)^x=\left(\dfrac{5}{3}\right)^{-2}-\left(\dfrac{-3}{5}\right)^4\)
1)tim x bit a)(1/2-1/3).6^x+6^x+2=6^15+6^18
b)3^x+3^x+2=2430
c)(2x-15)^5=(2x-15)^3
2) so saanh a)2^11 va 5^35
b)2^31 va 3^21
c)2^15 va 27^5.49^8 d)21^15 va 27^5.49^8
Tìm x :
27 mũ x phần 3 mũ x = 81
Tìm x :
9 . 27 ≤ \( (\dfrac{1}{3})^2 \) ≤ 27 . 243
(x+-2/9)^3=(8/27)^2
d) x-4/2= y-6/3= z-8/4 và x+y+z=27
d) x-4/2= y-6/3= z-8/4 và x+y+z=27
(x-1/2)3=1/27
