a-b к знаменателю a^2

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Приведите дробь а/a-b к знаменателю (a-b)^2

Приведите дробь а/a-b к знаменателю a^2 - b^2

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dtnth

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$\frac{a}{a-b}=\frac{a(a-b)}{(a-b)(a-b)}=\frac{a^2-ab}{(a-b)^2}$
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$\frac{a}{a-b}=\frac{a(a+b)}{(a-b)(a+b)}=\frac{a^2+ab}{a^2-b^2}$

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