1.

If $$a = \frac{x}{{x + y}}$$and $$b = \frac{y}{{x - y}}{\text{,}}$$then $$\frac{{ab}}{{a + b}}$$ &nbsp is equal to = ?

A. $\frac{{xy}}{{{x^2} + {y^2}}}$$
B. $\frac{{{x^2} + {y^2}}}{{xy}}$$
C. $\frac{x}{{x + y}}$$
D. ${\left( {\frac{y}{{x + y}}} \right)^2}$$
Answer» B. $\frac{{{x^2} + {y^2}}}{{xy}}$$


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