Разложение на множители
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/ ____\ / ____\
| y*\/ 30 | | y*\/ 30 |
1*(x + 0)*|x + --------|*|x - --------|*(y + 0)
\ 5 / \ 5 /
$$1 \left(x + 0\right) \left(x + \frac{\sqrt{30} y}{5}\right) \left(x - \frac{\sqrt{30} y}{5}\right) \left(y + 0\right)$$
(((1*(x + 0))*(x + y*sqrt(30)/5))*(x - y*sqrt(30)/5))*(y + 0)
Подстановка условия
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-15*x^3*y^2 + 18*x*y^4 при y = 1
$$- 15 x^{3} y^{2} + 18 x y^{4}$$
$$- 15 x^{3} y^{2} + 18 x y^{4}$$
$$y = 1$$
3 2 4
- 15*x *(1) + 18*x*(1)
$$18 (1)^{4} x - 15 (1)^{2} x^{3}$$
$$- 15 \cdot 1^{2} x^{3} + 18 \cdot 1^{4} x$$
$$- 15 x^{3} + 18 x$$