If x = 19 and y = 18, then the value of   $$ {{x^2}+{y^2}+{xy}}\over x^3-y3 $$ is

If   $$ a={b^2\over b-a} $$  then the value of a³ + b³ is 

Out of the given responses, one of the factors of (a² – b² )3 + (b² – c²) 3 + (c² – a²) 3 is

If x = y = 333 and z = 334, then the value of x³ + y³ + z³ – 3xyz is

If a = 34, b = c = 33, then the value of a³ + b³ + c³ – 3abc is

If a + b = 1 and a³ + b³ + 3ab = k, then the value of k is

If a + b + c = 6, a² + b² + c² = 14 and a³ + b³ + c³ = 36, then the value of abc is

If $${144\over0.144}={14.4\over x}$$, then the value of x is