Предмет: Математика, автор: Незнал

Помогите мне пожалуйста. очень прошу

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Автор ответа: гюйс

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$..........= frac{ (a-3b)(a+3b) }{4a^{2} } * frac{a}{4(a+3b)}= frac{a-3b}{16a}$

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