Đáp án: $E = -2y(\sqrt x- \sqrt y)$ Giải thích các bước giải: $\begin{array}{l}E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y) – x\sqrt x + y\sqrt y\\ \to E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y) – (\sqrt{x^3} – \sqrt{y^3})\\ \to E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y) – (\sqrt x – \sqrt y)(x + \sqrt{xy} + y)\\ \to E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y – x – \sqrt{xy} – y)\\ \to E = -2y(\sqrt x- \sqrt y)\end{array}$ Reply
Đáp án:
$E = -2y(\sqrt x- \sqrt y)$
Giải thích các bước giải:
$\begin{array}{l}E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y) – x\sqrt x + y\sqrt y\\ \to E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y) – (\sqrt{x^3} – \sqrt{y^3})\\ \to E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y) – (\sqrt x – \sqrt y)(x + \sqrt{xy} + y)\\ \to E = (\sqrt x – \sqrt y)(x + \sqrt{xy} – y – x – \sqrt{xy} – y)\\ \to E = -2y(\sqrt x- \sqrt y)\end{array}$