(a + b + c)*(a + b - c)*(a + c - b)*(b + c - a)
(a + b + c)*(a + b - c)*(a + c - b)*(b + c - a)
-(a + b + c)*(a + b - c)*(a + c - b)*(a - b - c)
$$- \left(a - b - c\right) \left(a - b + c\right) \left(a + b - c\right) \left(a + b + c\right)$$
-(a + b + c)*(a + b - c)*(a + c - b)*(a - b - c)
Рациональный знаменатель
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4 4 4 2 2 2 2 2 2
- a - b - c + 2*a *b + 2*a *c + 2*b *c
$$- a^{4} + 2 a^{2} b^{2} + 2 a^{2} c^{2} - b^{4} + 2 b^{2} c^{2} - c^{4}$$
-a^4 - b^4 - c^4 + 2*a^2*b^2 + 2*a^2*c^2 + 2*b^2*c^2
4 4 4 2 2 2 2 2 2
- a - b - c + 2*a *b + 2*a *c + 2*b *c
$$- a^{4} + 2 a^{2} b^{2} + 2 a^{2} c^{2} - b^{4} + 2 b^{2} c^{2} - c^{4}$$
-a^4 - b^4 - c^4 + 2*a^2*b^2 + 2*a^2*c^2 + 2*b^2*c^2