A. quiet

B. historic

C. incredibly

D. dislike

\(\left(x+\dfrac{1}{2}\right)^4=\dfrac{2^4}{3^4}\Leftrightarrow x+\dfrac{1}{2}=\dfrac{2}{3}\Leftrightarrow x=\dfrac{1}{3}\)

a,\(x^2+\dfrac{2}{3}=\dfrac{-3}{4}\Leftrightarrow x^2=\dfrac{-17}{12}\Leftrightarrow x=\sqrt{\dfrac{-17}{12}}\)

Dê

A=\(\left[0,8.\left(7+0,8\right)\right].\left[1,25.\left(7-\dfrac{4}{5}\right)\right]+31,64\)

=(0,8.7,8).(1,25.\(\dfrac{31}{5}\))+31,64

=48,36+31,64=80

\(\dfrac{9}{2}\left(\dfrac{2}{12}-\dfrac{6}{12}\right)\le x\le\dfrac{2}{3}\left(\dfrac{4}{12}-\dfrac{6}{12}-\dfrac{9}{12}\right)\)

\(\Leftrightarrow\dfrac{9}{2}.\dfrac{-4}{12}\le x\le\dfrac{2}{3}.\dfrac{-11}{12}\)\(\Leftrightarrow\dfrac{-3}{2}\le x\le\dfrac{-11}{18}\)

\(\Rightarrow x=-1\)