toán đại 9

L

lp_qt

Câu 1

$\sqrt{x} >x \iff \left\{\begin{matrix}
x \ge 0 & \\
x>x^2 &
\end{matrix}\right. \iff \left\{\begin{matrix}
x \ge 0 & \\
0 < x <1 &
\end{matrix}\right. \iff 0<x<1$
 
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