Question

Can some one explain me this very fast please and also formulae​

Answer 1

Answer:

Hope my answer helps you mate :-)

Step-by-step explanation:

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As power only subtract if they are in division

Answer 2

$= \frac{1}{1 +\frac{x {}^{a} }{x {}^{b} }} + \frac{1}{1 +\frac{x {}^{b} }{x {}^{a} }} \\ = \frac{1}{\frac{ {x}^{b} + x {}^{a} }{x {}^{b} }} + \frac{1}{\frac{ {x}^{a} + x {}^{b} }{x {}^{a} }} \\ = \frac{ {x}^{b} }{x {}^{a} + x {}^{b} } + \frac{ {x}^{a} }{x {}^{a} + x {}^{b} } \\ = \frac{x {}^{a} + x {}^{b} }{x {}^{a} + x {}^{b}} \\ = 1$

Hope the solution is clear to you !!