book Maths Puzzle Numerical Ability

X(1/3)/X = 1/X(2/3) but what is the way you get that answer?

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book Other Question

How do you solve this triangle: a=33 b=52 c=21 can you please help me to factorize the following
1. a^2(b+c)+b^2(c+a)+c^2(a+b)+2abc

2. ab(a^2-b^2)+bc(b^2-c^2)+ca(c^2-a^2)

3. Use factor theorem to prove ;(x+y+z)^3-(y+z-x)^3-(z+x-y)^3-(x+y-z)=24xyz