2 câu trả lời
$\frac{4}{9}$ -25 $x^{2}$ =0
25 $x^{2}$ =0+ $\frac{4}{9}$
25 $x^{2}$ = $\frac{4}{9}$
$x^{2}$ = $\frac{4}{9}$ :25
$x^{2}$ = $\frac{4}{225}$
x= $\frac{2}{15}$
$\frac{4}{9}$ -25 $x^{2}$ =0
25 $x^{2}$ =0+ $\frac{4}{9}$
25 $x^{2}$ = $\frac{4}{9}$
$x^{2}$ = $\frac{4}{9}$ :25
$x^{2}$ = $\frac{4}{225}$
x= $\frac{2}{15}$