Question

plz help




I'll remove wrong answers which make no sense​

Answer 1

Step-by-step explanation:

see the attached document

Answer 2

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$\frac{x + y + z}{ {x}^{ - 1} {y}^{ - 1} + {y}^{ - 1} {z}^{ - 1} + {z}^{ - 1} {x}^{ - 1} } \\ = \frac{x + y + z}{ \frac{1}{xy} + \frac{1}{yz} + \frac{1}{zx} } \\ = \frac{x + y + z}{ \frac{z + x + y}{xyz} } \\ =( x + y + z) \times \frac{xyz}{x + y + z }\\ = xyz$