Tìm \(x\) biết \(2\dfrac{1}{3}+3,2.x^2=\dfrac{10}{3}\)?
\(\dfrac{5}{4}.\)\(\dfrac{5}{16}.\)\(\sqrt{\dfrac{5}{16}}.\)\(\pm\sqrt{\dfrac{5}{16}}.\)Hướng dẫn giải:\(2\dfrac{1}{3}+3,2.x^2=\dfrac{10}{3}\)
\(\dfrac{7}{3}+\dfrac{16}{5}x^2=\dfrac{10}{3}\)
\(\dfrac{16}{5}x^2=\dfrac{10}{3}-\dfrac{7}{3}=1\)
\(x^2=\dfrac{5}{16}\)
\(x=\sqrt{\dfrac{5}{16}}\) hoặc \(x=-\sqrt{\dfrac{5}{16}}\).
