x 3 + y 3 + z 3 − 3xyz (x + y + z)(x 2 + y 2 + z 2 − xy − yz − zx) x = 1.2, y = 0.8, z = 0.7 = (1.2)3 +(0.8)3 +(0.73 −2.016 / 1.35[(1.2)2 +(0.8)2 +(0.7)2 −0.96−0.84−0.56] = ((2.7)((1.2)2 +(0.8)2 +(0.7)2 −0.96−0.84−0.56) / 1.35[(1.2)2 +(0.8)2 +(0.7)2 −0.96−0.84−0.56] = 2.7 / 1.35 = 2
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