$${ \left( \frac{ 8x }{ 11 } - \frac{ 15y }{ 17 } - \frac{ 17z }{ 18 } \right) }^{ 2 }$$
$\frac{\left(2448x-2970y-3179z\right)^{2}}{11329956}$
$\frac{5yz}{3}-\frac{136xz}{99}-\frac{240xy}{187}+\frac{64x^{2}}{121}+\frac{225y^{2}}{289}+\frac{289z^{2}}{324}$
