Question

please solve this three questions..

Answer 1

first one is easy.

Let
$\: \sqrt{y \div x } \times \sqrt{z \div y} \times \sqrt{x \div \: z} = a$
$on \: squaring$
$y/x \: \times z \div y \times x \div z ={a}^{2}$
$1 = {a}^{2}$
a=1