Question

tìm x 2/5 căn 25x -50 = 6

Answer 1

ĐKXĐ: \(x\ge2\)

\(\dfrac{2}{5}\sqrt{25x-50}=6\)

\(\Leftrightarrow\dfrac{2}{5}\sqrt{25\left(x-2\right)}=6\)

\(\Leftrightarrow2\sqrt{x-2}=6\Leftrightarrow\sqrt{x-2}=3\)

\(\Leftrightarrow x-2=9\Leftrightarrow x=11\left(tm\right)\)

Answer 2

\(ĐK:x\ge2\\ PT\Leftrightarrow\dfrac{2}{5}\cdot5\sqrt{x-2}=6\\ \Leftrightarrow2\sqrt{x-2}=6\Leftrightarrow\sqrt{x-2}=3\\ \Leftrightarrow x-2=9\\ \Leftrightarrow x=11\left(tm\right)\)

Answer 3

\(\dfrac{2}{5}\sqrt{25x-50}=6\)

\(\Leftrightarrow\dfrac{2}{5}\sqrt{25\left(x-2\right)}=6\)

\(\Leftrightarrow2\sqrt{x-2}=6\)

\(\Leftrightarrow\sqrt{x-2}=3\)

\(\Leftrightarrow x-2=9\)

\(\Leftrightarrow x=11\)