\(ax^{2}+bx+c=0,\ x=\frac{?}{2a}\)
\(-b\pm \sqrt{b^{2}-4ac}\)
\(c^{2}={?}\)
\(a^{2}+b^{2}\)
\(\frac{5}{6}\times \frac{3}{10}={?}\)
\(\frac{1}{4}\)