Помогите пожалуйста с алгеброй.. Created by Xilovivan. algebra-ru

Помогите пожалуйста с алгеброй...

taisasnitko

Ответ:

Объяснение:А) a²/(a+b)-b²/(a+b)=(a²-b²)/(a+b)=a-b.

Б)a²/(a-b)+b²/(b-a)=a²/(a-b) - b²/(a-b)=(a²-b²)/(a-b)= a+b.

B) =a ²/(a-b)+b²/(a-b)=(a²+b²)/(a-b).

5. 9/(2n-6)-n²/(2n-6)=(9-n²)/2(n-3)=(3-n)(3+n)/2(n-3)= - (3+n)/2.

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taisiyaeglit

Ответ:

А)

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

Б)

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

В)

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

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