Рациональный знаменатель
[src]
$$\frac{x + 7}{- x^{2} + 49}$$
7 x
------- + -------
2 2
49 - x 49 - x
$$\frac{x}{- x^{2} + 49} + \frac{7}{- x^{2} + 49}$$
7/(49 - x^2) + x/(49 - x^2)
-10 - x 17 + 2*x
-------- + --------
49 - x*x 49 - x*x
$$\frac{- x - 10}{- x x + 49} + \frac{2 x + 17}{- x x + 49}$$
-10 - x 17 + 2*x
------- + --------
2 2
49 - x 49 - x
$$\frac{- x - 10}{- x^{2} + 49} + \frac{2 x + 17}{- x^{2} + 49}$$
17 + 2*x 10 + x
-------- - -------
2 2
49 - x 49 - x
$$- \frac{x + 10}{- x^{2} + 49} + \frac{2 x + 17}{- x^{2} + 49}$$
(17 + 2*x)/(49 - x^2) - (10 + x)/(49 - x^2)