Jawabanmu

2014-03-12T18:35:58+07:00
X1^3+x2^3+x3^3 = (x1+x2+x3)^3-3(x1+x2+x3)(x1x2+x2x3+x1x3)+3(x1x2x3)
x1^3+x2^3+x3^3 = (-1/1)^3-3(-1)(1)+3(-6)
x1^3+x2^3+x3^3 = -1+3-18
x1^3+x2^3+x3^3 = -16

CMIIW :3
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