Question

(x-y)/(x+y)by(y+x)/(y-x)=​

Answer 1

Answer:

I'll use substitutions to make it clearer,

A=x%2By

B=x-y

-B=y-x

..

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%28%28x-y%29%2F%28x%2By%29%29%2F%28%28y-x%29%2F%28y%2Bx%29%29=%28B%2FA%29%2F%28-B%2FA%29

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Dividing by a fraction is equivalent to multiplying by its reciprocal,

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%28%28x-y%29%2F%28x%2By%29%29%2F%28%28y-x%29%2F%28y%2Bx%29%29=%28B%2FA%29%2A%28-A%2FB%29

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%28%28x-y%29%2F%28x%2By%29%29%2F%28%28y-x%29%2F%28y%2Bx%29%29=-1