Wykaż,że jezeli x+y+z=0 tox^3+y^3+z^3=3xyz
prosze o pelne rozwiazanie i komentarze
dam naj
x^3+y^3+z^3-3xyz=(x+y+z)(x^2+y^2+z^2-xy-xz-yz)
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x^3+y^3+z^3-3xyz=(x+y+z)(x^2+y^2+z^2-xy-xz-yz)