Ta có:
\(\dfrac{3^{x+5}}{9^3}=27^4\)
\(\Leftrightarrow\dfrac{3^{x+5}}{3^6}=3^{12}\Leftrightarrow3^{x+5}=3^{18}\Leftrightarrow x+5=18\Leftrightarrow x=13\)
Tìm \(x\), biết :
a) \(\left(2x+3\right)^2=\dfrac{9}{121}\)
b) \(\left(3x-1\right)^3=-\dfrac{8}{27}\)
1: Tính : \(\dfrac{\left(\dfrac{2}{5}\right)^7.5^7+\left(\dfrac{9}{4}\right)^3:\left(\dfrac{3}{16}\right)^3}{2^7.5^2+512}\) 2 . Tìm x biết :\(\left(5.x+1\right)^2=\dfrac{36}{49}\)
Bài 1: Tìm x:
\(\left(x+\dfrac{2}{3}\right)^5=\left(x+\dfrac{2}{5}\right)^3\)
Bài 2: Tìm x,y\(\in\) N biết:
\(\dfrac{27^x}{3^{2x-y}}=243\) và \(\dfrac{25^x}{5^{x+y}}=125\)
tìm x biết (4/9)x+1=(8/27)^6
tìm x biết (4/9)x+1=(8/27)^6
1.Tìm x, biết:
a. 2x ; b. 5x c. 3x : 35 d. \(\dfrac{16}{2^x}=2\) e. 8x : 2x f. 2x . 3x = 36 g. \(\dfrac{\left(-3\right)^n}{81}=-27\)
tìm x biết
a) \(\dfrac{2}{5}-\left(\dfrac{1}{10}-x\right)=\left(\dfrac{-2}{5}-\dfrac{1}{2}\right)^2\)
b) \(\dfrac{2}{5}-\dfrac{3}{5}\left(x-2\right)=\left(\dfrac{-1}{2}\right)^3-\left(\dfrac{3}{4}\right)^3.\left(-2\right)^2\)
Tìm x,biết: a)x : \((\dfrac{3}{4})^{3} = (\dfrac{3}{4})^{2} \) b) \(\dfrac{2}{5}^{5} . x = \dfrac{2}{5}^{8}\)
tìm x biết: x:\((\dfrac{3}{4})^3=(\dfrac{3}{4})^2\)
b) \((\dfrac{2}{5})^5.x=(\dfrac{2}{5})^8\)
