B = (\(\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^4}\) ) . \(3^5\) . ( \(\frac{1}{3^5}+\frac{1}{3^6}+\frac{1}{3^7}+\frac{1}{3^8}\) ) . \(3^9\) + ..........+ ( \(\frac{1}{3^{97}}+\frac{1}{3^{98}}+\frac{1}{3^{99}}+\frac{1}{3^{100}}\)) . \(3^{101}\)
Tìm x,y :
a, ( 2x - 3 )\(^6\)= ( 2x - 3 )\(^8\)
b, Tìm x,y thỏa mãn
\(\left(\frac{3x-5}{9}\right)\) + \(\left(\frac{3y+0,4}{3}\right)\)\(^{2004}\) = 0
giúp mk nha cảm ơn trước ạ ahjhj !!!!
Bài 2:
a: \(\Leftrightarrow\left(2x-3\right)^8-\left(2x-3\right)^6=0\)
\(\Leftrightarrow\left(2x-3\right)\left(2x-2\right)\left(2x-4\right)=0\)
hay \(x\in\left\{\dfrac{3}{2};1;2\right\}\)
b: \(\Leftrightarrow\left\{{}\begin{matrix}\dfrac{3x-5}{9}=0\\\dfrac{3y+0.4}{3}=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}3x-5=0\\3y+0.4=0\end{matrix}\right.\Leftrightarrow\left(x,y\right)=\left(\dfrac{5}{3};-\dfrac{2}{15}\right)\)
