book Maths Puzzle Numerical Ability

How do you solve 3 over the square root of 48

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book Other Question

(x/xy-y^2)-(y/xy-x^2)-1/x
please help me solve this fractional exponent
thank you
How do you solve, in step by step form:
-(3/5)[2/3-1/2(3/4-1/2)]