( x – 1/2 )mũ 3 – 1/5 = -17/125

Đáp án:

Giải thích các bước giải:

\(\begin{array}{l}{\left( {x – {\rm{ }}1/2} \right)^3} – \frac{1}{5}{\rm{ }} = \frac{{ – 17}}{{125}}\\ \Leftrightarrow {\left( {x – \frac{1}{2}} \right)^3} = \frac{1}{5} – \frac{{17}}{{125}}\\ \Leftrightarrow {\left( {x – \frac{1}{2}} \right)^3} = \frac{8}{{125}}\\ \Leftrightarrow {\left( {x – \frac{1}{2}} \right)^3} = {\left( {\frac{2}{5}} \right)^3}\\ \Rightarrow x – \frac{1}{2} = \frac{2}{5}\\ \Rightarrow x = \frac{2}{5} + \frac{1}{2}\\ \Rightarrow x = \frac{9}{{10}}\end{array}\)