Упростите выражение:
[tex]( \sqrt{x} - \sqrt{y} )(x+ \sqrt{xy} +y)[/tex].

а)[tex] \frac{2*3 ^{n+2}-5*3 ^{n+1} }{3 ^{n-1} } ;[/tex]
б)[tex] \frac{25*4 ^{n} }{4 ^{n}-4 ^{n-1} } [/tex]
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