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[tex] \frac{25a^2-b^2}{25a^2-10ab+b^2} : (5a^2+ab)(2b-10a) [/tex]
[tex] \frac{25a^2-b^2}{25a^2-10ab+b^2} : (5a^2+ab)(2b-10a) [/tex]
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-------- * ----------- * (-2(5a-b)) =>
5a-b a(5a+b)
=> 1 (-10a+ 2b) -2
-------- * = -------
a(5a-b) a
Ответ -2/а