X = z3 + z – 8y = x3 + x – 8z = y3 + y – 8nilai dari 1/3(x+y+z) adalah…

X = z3 + z – 8
y = x3 + x – 8
z = y3 + y – 8  +
x+y+z = x3+y3+z3 +x+y+z -8 -8 -8

0 = x3+y3+z3 -8 -8 -8
x3+y3+z3 = 8 + 8 + 8
x³+y³+z³ = 2³+2³+2³
x + y + z = 2 + 2 + 2
x + y + z = 6
nilai dari 1/3(x+y+z) adalah. 1/3(6) = 2