Помогите, пожалуйста, Упростить выражение:....................................................................................................................................................................................................................................................................................![\frac{ \sqrt{a}- \sqrt{b} }{ \sqrt[4]{a} - \sqrt[4]{b} } - \frac{ \ \sqrt{a} + \sqrt[4]{ab} }{ \sqrt[4]{a}+ \sqrt[4]{b} }](https://tex.z-dn.net/?f=+%5Cfrac%7B+%5Csqrt%7Ba%7D-+%5Csqrt%7Bb%7D+%7D%7B+%5Csqrt%5B4%5D%7Ba%7D+-+%5Csqrt%5B4%5D%7Bb%7D+%7D+-+%5Cfrac%7B+%5C+%5Csqrt%7Ba%7D+%2B+%5Csqrt%5B4%5D%7Bab%7D+%7D%7B+%5Csqrt%5B4%5D%7Ba%7D%2B+%5Csqrt%5B4%5D%7Bb%7D+%7D+ "\frac{ \sqrt{a}- \sqrt{b} }{ \sqrt[4]{a} - \sqrt[4]{b} } - \frac{ \ \sqrt{a} + \sqrt[4]{ab} }{ \sqrt[4]{a}+ \sqrt[4]{b} }")