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81*x^6+72*x^3*y^2+16*y^4 если y=1/3

Выражение, которое надо упростить:

Решение

Вы ввели [src]
    6       3  2       4
81*x  + 72*x *y  + 16*y 
$$81 x^{6} + 72 x^{3} y^{2} + 16 y^{4}$$
81*x^6 + 72*x^3*y^2 + 16*y^4
Разложение на множители [src]
  /                  _____\ /                  _____                  _____\ /                  _____                  _____\
  |     2/3 3 ___ 3 /   2 | |     2/3 3 ___ 3 /   2       2/3  5/6 3 /   2 | |     2/3 3 ___ 3 /   2       2/3  5/6 3 /   2 |
  |    2   *\/ 3 *\/  -y  | |    2   *\/ 3 *\/  -y     I*2   *3   *\/  -y  | |    2   *\/ 3 *\/  -y     I*2   *3   *\/  -y  |
1*|x - -------------------|*|x + ------------------- + --------------------|*|x + ------------------- - --------------------|
  \             3         / \             6                     6          / \             6                     6          /
$$1 \left(x - \frac{2^{\frac{2}{3}} \cdot \sqrt[3]{3} \sqrt[3]{- y^{2}}}{3}\right) \left(x + \left(\frac{2^{\frac{2}{3}} \cdot \sqrt[3]{3} \sqrt[3]{- y^{2}}}{6} + \frac{2^{\frac{2}{3}} \cdot 3^{\frac{5}{6}} i \sqrt[3]{- y^{2}}}{6}\right)\right) \left(x + \left(\frac{2^{\frac{2}{3}} \cdot \sqrt[3]{3} \sqrt[3]{- y^{2}}}{6} - \frac{2^{\frac{2}{3}} \cdot 3^{\frac{5}{6}} i \sqrt[3]{- y^{2}}}{6}\right)\right)$$
((1*(x - 2^(2/3)*3^(1/3)*(-y^2)^(1/3)/3))*(x + (2^(2/3)*3^(1/3)*(-y^2)^(1/3)/6 + i*2^(2/3)*3^(5/6)*(-y^2)^(1/3)/6)))*(x + (2^(2/3)*3^(1/3)*(-y^2)^(1/3)/6 - i*2^(2/3)*3^(5/6)*(-y^2)^(1/3)/6))
Подстановка условия [src]
81*x^6 + 72*x^3*y^2 + 16*y^4 при y = 1/3
подставляем
    6       3  2       4
81*x  + 72*x *y  + 16*y 
$$81 x^{6} + 72 x^{3} y^{2} + 16 y^{4}$$
    4       6       3  2
16*y  + 81*x  + 72*x *y 
$$81 x^{6} + 72 x^{3} y^{2} + 16 y^{4}$$
переменные
y = 1/3
$$y = \frac{1}{3}$$
        4       6       3      2
16*(1/3)  + 81*x  + 72*x *(1/3) 
$$81 x^{6} + 72 (1/3)^{2} x^{3} + 16 (1/3)^{4}$$
16      3       6
-- + 8*x  + 81*x 
81               
$$81 x^{6} + 8 x^{3} + \frac{16}{81}$$
16/81 + 8*x^3 + 81*x^6
Численный ответ [src]
16.0*y^4 + 81.0*x^6 + 72.0*x^3*y^2
16.0*y^4 + 81.0*x^6 + 72.0*x^3*y^2
Комбинаторика [src]
             2
/   2      3\ 
\4*y  + 9*x / 
$$\left(9 x^{3} + 4 y^{2}\right)^{2}$$
(4*y^2 + 9*x^3)^2