Đáp án + Giải thích các bước giải:
`3(5x+(2)/(3))^{2}=(4)/(3)`
`=>(5x+(2)/(3))^{2}=(4)/(3):3`
`=>(5x+(2)/(3))^{2}=(4)/(9)`
`=>` \(\left[ \begin{array}{l}5x+\dfrac{2}{3}=\dfrac{2}{3}\\5x+\dfrac{2}{3}=-\dfrac{2}{3}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}5x=0\\5x=-\dfrac{4}{3}\end{array} \right.\)
`=>` \(\left[ \begin{array}{l}x=0\\x=-\dfrac{4}{15}\end{array} \right.\)
Vậy `x∈{0;-(4)/(15)}`
