Tìm x biết:
\(a)\left(2x-1\right)^3=-8\)
\(b)\left(x+\dfrac{1}{2}\right)^2=\dfrac{1}{16}\)
\(c)\left(2x+3\right)^2=\dfrac{9}{121}\)
\(d)\left(2x-1\right)^3=\dfrac{-8}{27}\)
So sánh:
\(a)99^{20}và9999^{10}\)
\(b)3^{4000}và9^{2000}\)
\(c)2^{332}và3^{223}\)