Предмет: Математика, автор: annamishchenko23

 Обчисли значення дробу b-3a/a якщо b/a=5

Приложения:

Ответы

Автор ответа: bakhtovarhimatov2005
0

Ответ:

1)(х-5)(х+5)/х+5=х-5

2) \frac{b}{a}  -  \frac{3a}{a}  =  \frac{b}{a}  - 3 = 6 - 3 = 3

Автор ответа: papagenius
1

Решение и ответ:

\displaystyle \frac{{{x^2}-25}}{{x+5}} = \frac{{{x^2}-{5^5}}}{{x+5}}=\frac{{\left( {x-5} \right)\left( {x +5} \right)}}{{x+5}}=x-5

\displaystyle \frac{{b-3a}}{a} = \frac{b}{a}-\frac{{3a}}{a}=\frac{b}{a}-3=6-3=3

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Упражнение 3. Раскройте скобки, чтобы образовать условные предложения I типа
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