Question

Giúp mình nhaa mình cần gấp

Answer 1

=\(\dfrac{\left(\sqrt{x}+\sqrt{y}\right)^2-\left(\sqrt{x}-\sqrt{y}\right)^2}{x-y}+\dfrac{\sqrt{xy}}{x-y}\)

=\(\dfrac{\left(\sqrt{x}+\sqrt{y}-\sqrt{x}+\sqrt{y}\right)\left(\sqrt{x}+\sqrt{y}+\sqrt{x}-\sqrt{y}\right)}{x-y}+\dfrac{\sqrt{xy}}{x-y}\)

=\(\dfrac{4\sqrt{xy}}{x-y}+\dfrac{\sqrt{xy}}{x-y}\)=\(\dfrac{5\sqrt{xy}}{x-y}\) mk ko hiểu làm sao để chứng minh ra bằng 4 nữa cơ .