[Toán 8] Giải phương trình

S

soccan

$1)\\
\sqrt{x}-x=0 \longleftrightarrow \sqrt{x}(1-\sqrt{x})=0$
nên $S=\left \{ 0;1 \right \}$
$2)\\
\sqrt{x+1}=x \longleftrightarrow x^2-x-1=0 \longleftrightarrow (x-\dfrac{1}{2})^2=\dfrac{5}{4}$
 
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