Cho xyz=1 ; $x+y+z=\frac{1}{x}+\frac{1}{y}+\frac{1}{z}$.
Tính $K=(x^{31}-1)(y^{5}-1)(z^{85}-1)$
Cho xyz=1 ; $x+y+z=\frac{1}{x}+\frac{1}{y}+\frac{1}{z}$. Tính $K=(x^{31}-1)(y^{5}-1)(z^{85}-1)$
Started By trucquynh, 31-10-2017 - 01:23
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