-ô9lkhmt n pobgolnb
\(abc\ge\frac{\left(252^3\left(63a+36b+28c+756\right)-252\right)\Sigma\left(28c+252\right)\left(63a-36b\right)^2}{63504\Pi\left(63a+252\right)\left(63a+36b+28c+756\right)}\)
\(+\frac{1}{63504}\Pi\left(63a+252\right)\left(\frac{63a+36b+28c-1512}{63a+36b+28c+756}\right)+\frac{508032.252}{63504}\ge2016\)
dau "=" xay ra khi \(\left(a;b;c\right)=\left(8;14;18\right)\)