k hiểu đề bài của bạn nên tớ làm theo ý hiểu của tớ nhé
\(\frac{x-\frac{1}{2}}{7}=\frac{-49}{\left(x-\frac{1}{2}\right)^2}\)
\(\Leftrightarrow\frac{2x-1}{14}=-\frac{196}{\left(2x-1\right)^2}\)
<=> (2x - 1)(2x - 1)2 = -14.196
<=> (2x - 1)3 = -2744
<=> (2x - 1)3 = -143
<=> 2x - 1 = -14
<=> 2x = -14 + 1
<=> 2x = -13
<=> x = -13/2
=> x = -13/2
\(\frac{x-\frac{1}{2}}{7}=\frac{-49}{\left(x-\frac{1}{2}\right)^2}\)
\(\Rightarrow\left(x-\frac{1}{2}\right).\left(x-\frac{1}{2}\right)^2=7.\left(-49\right)\)
\(\Rightarrow\left(x-\frac{1}{2}\right)^3=-343\)
\(\Rightarrow\left(2x-1\right)^3=\left(-7\right)^3\)
\(\Rightarrow2x-1=-7\)
\(\Rightarrow2x=-6\)
\(\Rightarrow x=-3\)
