4/9-25x^2=0 ;)))))))))))))))))

2 câu trả lời

4/9-25x^2=0

4/9=25x^2

4/9:25=x^2

4/9.1/25=x^2

4/225=x^2

x=2/15

x=-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= $\frac{2}{15}$