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dada a função f x y z xyz calcule f 1 2 3
x y z 2 -1 2
x y 2 - z 2
x y z + 1
x 2+y 2+z 2 xyz
xy z 2+1 +z x 2+y 2
x 2-yz+zx-y 2
xyz 1-x 1-y 1-z
xyz+2 x+y+z
z xy x+y 1
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