if $$x-{1\over 5},x≠0,$$ then what is the value of $${x^6+3x^3-1}\over x^6-8x^3-1$$=?

If a = 7, b = 5 and c = 3, then the value of $$a^2+b^2+c^2-ab-bc-ca$$ is 

If p³ – q³ = (p-q)[(p-q)²+xpq)] then the value of x is

If $$p×q=p+q+{p\over q}$$, the value of 8 × 2  is : 

If x is real then the minimum value of (x²-x-1) is :

If $$ {(x-5)^{2} +{(y-2)^{2}}+{(z-9)^{2}=0}}$$ then what is the value of (x+y-z)?

If x = a - b, y = b - c, z = c - a, then the numerical value of the algebraic expression x³ +y³ + z³ -3xyz will be 

If a^2x+2=1, where a is a positive real number other than 1, then x is equal to